Last Updated on December 20, 2020 by Chuck Wilson
The DEC differs from the DE model with the addition of headlights, taillights, and a horn. The High Range/Low Range capability was available in the 1966 through 1968 DEC.
The Harley Davidson Golf Cart was manufactured from 1963 through 1982 and came in models DE, DEC, DEF, DE-3, and DE-4
Article Contents
1966-67 Model DEC Heavy Cable Diagram
1966-67 Model DEC 16 Gauge Cable Diagram
The above diagram is correct for the 1966 and 1967 model DEC. The 1966 model changed from a belt drive to a direct drive axle requiring the motor to rotate in the opposite direction from the prior models. The key switch connections changed so that REV becomes FWD for solenoids A and B and FWD becomes REV for solenoids C and D.
1966-67 Model DEC Charging
- Key switch – Off
- Speed Switch – at resting stop
- Solenoid “A” Open – Voltage not applied to small terminals
- Solenoid “B” Open – Voltage not applied to small terminals
- Solenoid “C” Open – Voltage not applied to small terminals
- Solenoid “D” Open – Voltage not applied to small terminals
- Solenoid “E” Open – Voltage not applied to small terminals
- Solenoid “F” Open – Voltage not applied to small terminals
- Solenoid “G” Open – Voltage not applied to small terminals – Lower contacts closed and bridging
- Solenoid “H” Open – Voltage not applied to small terminals – Lower contacts closed and bridging
- Voltage to Motor – None
- Voltage across A1 and A2 – None
- Micro Switch – Open
1966-67 Model DEC First Speed High Range
High Range – 36 volts – 6 batteries in series
- Key Switch – FWD
- Speed Switch – Moved off of resting stop – Not in contact with terminal 8 yet
- Solenoid “A” Energized – Continuity between large terminals
- Solenoid “B” Energized – Continuity between Large terminals – Voltage redirected through full resistor
- Solenoid “C” Open – Voltage not applied to small terminals
- Solenoid “D” Open – Voltage not applied to small terminals
- Solenoid “E” Open – Voltage not applied to small terminals
- Solenoid “F” Open – Voltage not applied to small terminals
- Solenoid “G” Open – Voltage not applied to small terminals – Lower contacts closed and bridging
- Solenoid “H” Open – Voltage not applied to small terminals – Lower contacts closed and bridging
- Voltage to Motor – Present
- Voltage across A1 and A2 – Present
- Micro Switch – Closed
1966-67 Model DEC Second Speed High Range
High Range – 36 volts – 6 batteries in series
- Key switch – FWD
- Speed Switch – at Terminal 8
- Solenoid “A” Energized – Continuity between large terminals
- Solenoid “B” Energized – Continuity between Large terminals
- Solenoid “C” Open – Voltage not applied to small terminals
- Solenoid “D” Open – Voltage not applied to small terminals
- Solenoid “E” Energized – Continuity between large terminals – Voltage redirected through middle tap on resistor
- Solenoid “F” Open – Voltage not applied to small terminals
- Solenoid “G” Open – Voltage not applied to small terminals – Lower contacts closed and bridging
- Solenoid “H” Open – Voltage not applied to small terminals – Lower contacts closed and bridging
- Voltage to Motor – Present
- Voltage across A1 and A2 – Present
- Micro Switch – Closed
1966-67 Model DEC Third Speed High Range
High Range – 36 volts – 6 batteries in series
- Key Switch – FWD
- Speed Switch – at Teminal 11
- Solenoid “A” Energized – Continuity between large terminals
- Solenoid “B” Energized – Continuity between large terminals
- Solenoid “C” Open – Voltage not applied to small terminals
- Solenoid “D” Open – Voltage not applied to small terminals
- Solenoid “E” Open – Voltage not applied to small terminals
- Solenoid “F” Energized – Continuity between large terminals – Voltage bypassing resistor
- Solenoid “G” Open – Voltage not applied to small terminals – Lower contacts closed and bridging
- Solenoid “H” Open – Voltage not applied to small terminals – Lower contacts closed and bridging
- Voltage to Motor – Present
- Voltage across A1 and A2 – Present
- Micro Switch – Closed
1966-67 Model DEC First Speed Low Range
Low Range – 18 volts – 2 sets of batteries in parallel
- Key Switch – FWD
- Speed Switch – Moved off of resting stop – Not in contact with terminal 8 yet
- Solenoid “A” Energized – Continuity between large terminals
- Solenoid “B” Energized – Continuity between Large terminals – Voltage redirected through full resistor
- Solenoid “C” Open – Voltage not applied to small terminals
- Solenoid “D” Open – Voltage not applied to small terminals
- Solenoid “E” Open – Voltage not applied to small terminals
- Solenoid “F” Open – Voltage not applied to small terminals
- Solenoid “G” Energized – Continuity between upper large terminals placing batteries in parallel- Lower contacts open
- Solenoid “H” Energized – Continuity between upper large terminals placing batteries in parallel- Lower contacts open
- Voltage to Motor – Present
- Voltage across A1 and A2 – Present
- Micro Switch – Closed
1966-67 Model DEC Second Speed Low Range
Low Range – 18 volts – 2 sets of batteries in parallel
- Key switch – FWD
- Speed Switch – at Terminal 8
- Solenoid “A” Energized – Continuity between large terminals
- Solenoid “B” Energized – Continuity between Large terminals
- Solenoid “C” Open – Voltage not applied to small terminals
- Solenoid “D” Open – Voltage not applied to small terminals
- Solenoid “E” Energized – Continuity between large terminals – Voltage redirected through middle tap on resistor
- Solenoid “F” Open – Voltage not applied to small terminals
- Solenoid “G” Energized – Continuity between upper large terminals placing batteries in parallel- Lower contacts open
- Solenoid “H” Energized – Continuity between upper large terminals placing batteries in parallel- Lower contacts open
- Voltage to Motor – Present
- Voltage across A1 and A2 – Present
- Micro Switch – Closed
1966-67 Model DEC Third Speed Low Range
Low Range – 18 volts – 2 sets of batteries in parallel
- Key Switch – FWD
- Speed Switch – at Teminal 11
- Solenoid “A” Energized – Continuity between large terminals
- Solenoid “B” Energized – Continuity between large terminals
- Solenoid “C” Open – Voltage not applied to small terminals
- Solenoid “D” Open – Voltage not applied to small terminals
- Solenoid “E” Open – Voltage not applied to small terminals
- Solenoid “F” Energized – Continuity between large terminals – Voltage bypassing resistor
- Solenoid “G” Energized – Continuity between upper large terminals placing batteries in parallel- Lower contacts open
- Solenoid “H” Energized – Continuity between upper large terminals placing batteries in parallel- Lower contacts open
- Voltage to Motor – Present
- Voltage across A1 and A2 – Present
- Micro Switch – Closed
1966-67 Model DEC Reverse (First Speed Low Range Shown Only)
Low Range – 18 volts – 2 sets of batteries in parallel
- Key switch – REV
- Speed Switch – at Terminal 8
- Solenoid “A” Open – Voltage not applied to small terminals
- Solenoid “B” Open – Voltage not applied to small terminals
- Solenoid “C” Energized – Continuity between large terminals – S1 and S2 now reversed in polarity
- Solenoid “D” Energized – Continuity between large terminals – Voltage redirected through full resistor
- Solenoid “E” Open – Voltage not applied to small terminals
- Solenoid “F” Open – Voltage not applied to small terminals
- Solenoid “G” Energized – Continuity between upper large terminals placing batteries in parallel- Lower contacts open
- Solenoid “H” Energized – Continuity between upper large terminals placing batteries in parallel- Lower contacts open
- Voltage to Motor – Present
- Voltage across A1 and A2 – Present
- Micro Switch – Closed
1968 Model DEC 16 Gauge Cable Diagram
1968 Model DEC Heavy Cable Diagram
Differences in the 1966-67 Heavy Cable Diagram and the 1968 Heavy Cable Diagram is the addition of two (2) Circuit Breakers (Item 32), Motor Terminal S1 and S2 Reverse Connections.
Numbering Key for 1966 -1968 Diagrams
- Key Switch – 3 wires (Green, Blue, Yellow) For terminals 2, 3, and 4
- Key Switch Terminal – Green wire to Speed Switch Connection 9
- Key Switch Terminal – Blue wire to Speed Switch Connection 10
- Key Switch Terminal – Yellow wire to Micro Switch 13, Yellow wire to Speed Selector Switch 25
- Speed Switch (Contains Terminals 6, 7, 8, 9, 10, 11, and 12)
- Speed Switch Terminal – White wire to Terminal 12 on Switch Arm, Red wire to Micro Switch, Red wire to Solenoid Terminal G5 – 3 wires
- Speed Switch Terminal – White wire to 12v Tap on battery, White wire to Solenoid Terminal C2
- Speed Switch Terminal – Yellow wire to Solenoid Terminal E3
- Speed Switch Terminal – Green wire to Key Switch Terminal 2 and Green wire to Solenoid Terminal A3
- Speed Switch Terminal – Blue wire to Key Switch Terminal 3 and Blue wire to Solenoid Terminal C3
- Speed Switch Terminal – Red wire to Solenoid Terminal F3
- Speed Switch Arm Terminal – White wire jumper to Speed Switch Terminal 6
- Micro Switch – Yellow wire to Key Switch Terminal 4 and Red wire to Speed Switch Terminal 6
- Charger Connection Plug – Negative Terminal 1 Black wire to Speed Switch Terminal E4 and Positive Terminal 2 Red wire to Solenoid Terminal G1
- Motor – 5 wires
A1 – Black wire to Solenoid Terminal G1, Black wire to Right Rear Battery Positive Terminal
A2 – Black wire to Solenoid Terminal C1
S1 – Black Wire to Solenoid Terminal D1 (or to Solenoid Terminal B1 1968 Model only)
S2 – Black Wire to Solenoid Terminal B1 (or to Solenoid Terminal D1 1968 Model only) - Resistor – 3 wires
Terminal .1 – Black wire to Solenoid Terminal E1
Terminal .3 – Black wire to Solenoid Terminal F4
Unmarked Terminal – Black wire to Solenoid Terminal B4 - Solenoids A, B, C, D, E, F, G, and H
Solenoid A -Located top left (front of the cart)
A1 – Copper strap to Solenoid Terminal C1
A2 – White wire to Solenoid Terminal C2 and White wire to Solenoid Terminal D2
A3 -Green wire to Speed Switch Terminal 9 and Green wire to Solenoid Terminal B3
A4 – Copper Strap to Solenoid Terminal D1Solenoid B – Located bottom center
B1 – Copper Strap to Solenoid Terminal C4, Black wire to Motor Terminal S2 (or Motor Terminal S1 1968 Model only)
B2 – White wire to Solenoid Terminal D2
B3 – Green wire to Solenoid Terminal A3
B4 – Copper Strap to Solenoid Terminal D4, Black wire to unmarked Resistor TerminalSolenoid C – Located bottom Left (front of the cart)
C1 – Copper Strap to Solenoid Terminal A1, Black wire to Motor Terminal A2
C2 – White wire to Solenoid Terminal A2, White wire to Speed Switch Terminal 7
C3 – Blue wire to Solenoid Terminal D3, Blue wire to Speed Switch Terminal 10
C4 – Copper Strap to Solenoid Terminal B1Solenoid D – Located top center
D1 – Copper Strap to A4, Black wire to Motor Terminal S1 (or Motor Terminal S@ 1968 Model only)
D2 – White wire to Solenoid Terminal F2, White wire to Solenoid Terminal B2, White wire to Solenoid Terminal A2
D3 – Blue wire to Solenoid Terminal C3
D4 – Copper Strap to Solenoid Terminal F1, Copper Strap to Solenoid Terminal B4Solenoid E – Located bottom right (rear of the cart)
E1 – Black wire to Resistor Terminal .1
E2 – White wire to Solenoid Terminal F2
E3 – Yellow wire to Speed Switch Terminal 8
E4 – Copper Strap to Solenoid Terminal F4, Black wire to Charger Negative Terminal Solenoid F – Located top right (rear of the cart)
F1 – Copper Strap to Solenoid Terminal D4
F2 – White wire to Solenoid Terminal E2, White wire to Solenoid Terminal D2
F3 – Red wire to Speed Switch Terminal 11
F4 – Copper Strap to Solenoid Terminal E4, Black wire to Solenoid Terminal H1, Black wire to .3 Resistor Terminal, Black Wire to Speed Switch Terminal 6 Solenoid G – Left side of Solenoid Plate
G1 – Red wire to Pin 1 of Charger Plug, Black wire to Motor Terminal A1
G2 – White wire to Solenoid Terminal H2
G3 – Black wire to Solenoid Terminal H3, Black wire to Speed Selector Switch
G4 – Red wire to Light Switch, Black wire to Left Front Battery Positive Terminal (or to Circuit Breaker #1 Terminal 1 1968 Model only), Black wire to Solenoid Terminal H5
G5 – Black wire to Solenoid Terminal H4, Red wire to Speed Switch Terminal 11
G6 – Black wire to Solenoid Terminal H6Solenoid H (Speed Control Solenoid) – Left Side of Solenoid Plate
H1 – Black wire to Solenoid Terminal F4, Black wire to Front Right Battery Negative Terminal 20
H2 – White wire to Solenoid Terminal G2, White wire to Solenoid Terminal F2
H3 – Black wire to Solenoid Terminal G3
H4 – Black wire to Solenoid Terminal G5, Black wire to Rear Left Battery Negative Terminal (or to Circuit Breaker #2 Terminal 1 1968 Model only)
H5 – Black wire to Solenoid Terminal G4
H6 – Black wire to Solenoid Terminal G6 - Front Batteries (6 6-volt in series to give a total of 36-volts. Includes tap for 12 or 18-volts for the solenoid circuit. (see the dashed area at front batteries)
- Center Rear Battery Positive Terminal 12v Tap, White wire to Speed Switch Terminal 7
- Right Front Battery Negative Terminal – Black wire to Solenoid Terminal H1
- Right Rear Battery Positive Terminal – 18v Tap, Black wire to Motor Terminal A1
- Left Terminal Board – Green wire to Right Terminal Board 23, Green wire to Light Switch 29, Red wire to Left Tail Light
- Right Terminal Board – Green wire to Right Terminal Board 23, Green wire to Right Taillight, Green wire to Left Tail Light, Red wire to Right Tail Light
- Tail Light – Green wire to Terminal board 23, Red wire to Terminal Board 23
- Speed Selector Switch – Black wire to Solenoid Termina G3, Yellow wire to Key Switch Terminal 4
- Fuse – White wire to Right Front Battery Positive Terminal, wire to Solenoid Plate Screw 27
- Solenoid Plate Screw – wire to Fuse 26
- Headlight – White wire to Ground Bolt 32, Blue Wire to Light Switch 29
- Light Switch – Blue wire to Headlight 28, Red wire to Solenoid Termina G4, Green wire to Left Terminal Board 22, Yellow wire to Horn Button 31
- Horn – Yellow Wire to Horn Button 31
- Horn Button – Yellow wire to Light Switch, Yellow wire to Horn 30
- Circuit Breakers (2) (1968 Model DEC only) G5
1966 Through 1968 Models DE and DEC Troubleshooting Chart
| Symptom | Possible Cause | Remedy |
|---|---|---|
| Batteries Run Down Rapidly | ||
| Batteries not charging fully | Bad Battery | Test battery cells |
| Low Electrolyte Level | Refill cells with electrolyte | |
| Bad Charging Circuit | Inspect terminals and connections for looseness and corrosion | |
| Bad Charger | Use multimeter and test output voltage | |
| Battery Drain other than use | Corrosion | Inspect battery and speed switch contacts and clean where needed |
| Loose Connections | Tighten all terminals and connections | |
| Shorts in the Circuit | Check for frayed wires touching other terminals or debris shorting contacts | |
| Faulty Motor | Go through the motor testing procedures | |
| Drag or Resistance | Brakes tight | Adjust brakes |
| Low Tire Pressure | Fill tires to recommended pressure | |
| Wheel Bearings Dragging | Lubricate wheel bearings or replace if bad | |
| Incorrect Drive Belt Tension (63-65) | Adjust belt tension | |
| Differential Dragging | Check lubrication on differential and chassis | |
| Overloading | Verify carts carrying capacity is not exceeded | |
| Driving with foot on the brake | Don't...this will wear out the brakes prematurely as well. | |
| Slipping Drive Belt (63-65) | Drive Belt Out of Adjustment | Adjust belt tension |
| Cart Will Not Operate Forward or Reverse | ||
| Batteries Discharged | Check if charger is operating properly and charge batteries | |
| Speed Switch Failure or Linkage disconnected | Check the operation of the foot pedal moving the switch arm and test speed switch | |
| Key Switch Bad | Use continuity tester and replace if faulty | |
| Solenoids inoperative | Listen for solenoid clicks, and if no sound check wiring to terminals. Check solenoids with testing procedure. | |
| Micro Switch inoperable | Use multimeter to test micro switch operation | |
| Drive Belt Not Engaged | Adjust belt tension | |
| Motor Fault | Check brushes and armature, run motor test procedure | |
| Corroded Battery Terminals | Check and clean battery posts and connections | |
| Faulty Wiring Circuit | Using the wiring diagram for your model, trace out and correct any loose or broken connections | |
| Car Operates Forward, Not in Reverse | ||
| Reverse Solenoids C and/or D Inoperable | Use testing procedure on solenoids C and D | |
| Forward Solenoids A and/or B staying Closed | Use testing procedure on solenoids A and B | |
| Wiring Broken or Defective | Using the wiring guide, test wiring to electrical components | |
| Bad Key Switch | Using a continuity tester, perform continuity test on key switch terminals | |
| Car Operates in Reverse, Not in Forward | ||
| Forward Solenoids A and/or B Inoperable | Use testing procedure on solenoids A and B | |
| Reverse Solenoids C and/or D staying closed | Use testing procedure on solenoids C and D | |
| Wiring Broken or Defective | Using the wiring guide, test wiring to electrical components | |
| Bad Key Switch | Using a continuity tester, perform continuity test on key switch terminals | |
| Car Leaps or Jerks | ||
| Solenoids Sticking or Hanging | Use testing procedure on solenoid | |
| Faulty Resistor | Check resistor for breaks and check taps and connections | |
| Loose or Corroded Connections | Clean and tighten connections | |
| Cart Only Runs in First Speed | ||
| Second Speed Solenoid E and Third Speed Solenoid F Faulty | Use testing procedure on solenoid | |
| Faulty Wiring | Check connections and continuity from speed switch to solenoids | |
| Cart Runs in First and Third Speed, Not in Second Speed | ||
| Solenoid E Faulty | Use testing procedure on solenoid | |
| Faulty Wiring | Check connections and continuity from speed switch to solenoids | |
| Cart Runs in First and Second Speeds, Not in Third Speed | ||
| Solenoid F Faulty | Use testing procedure on solenoid | |
| Contacts on Speed Switch and on Third Speed not making a good contact | Check and clean contacts on speed switch | |
| Faulty Wiring | Check for open circuit, shorts, or loose connections | |
| Cart Will Run in Second and Third Speed, Not in First | ||
| Resistor open between .1 and .3 terminals | Check continuity on resistor and connections | |
| Faulty Wiring | Check connections and continuity from speed switch to solenoids | |
| Cart Will Not Run in First or Second Speeds, Only Third | ||
| .1 Ohm Section of Resistor between .1 and unmarked terminals open or both sections open | Use continuity tester on resistor terminals | |
| Faulty Wiring | Check continuity from resistor common terminal to solenoid | |
| Cart Runs in First Speed Then Jumps to Third Speed | ||
| Faulty Wiring | Check continuity of red and yellow wires from speed switch to solenoids | |
| Solenoid E Faulty | Use testing procedure on solenoid | |
| Cart Goes to Third Speed Immediately When Pedal is Pressed | ||
| Third Speed Solenoid F Stuck Closed | Use testing procedure on solenoid | |
| Faulty Wiring | Check wiring continuity fo blue and red wires from speed switch to solenoids | |
| Cart Goes to Second Speed Immediately When Pedal is Pressed, Third Speed Normal | ||
| Second Speed Solenoid E Stuck Closed | Use testing procedure on solenoid | |
| Faulty Wiring | Check wiring continuity from speed switch to solenoids | |
| Cart Starts Forward When Key Switches On | ||
| Speed Switch Stuck | Check speed switch | |
| Cart Does Not Stop With Key On | ||
| Speed Switch Arm Not Returning to Off Position | Check speed switch, return spring and linkage | |
| Cart Does Not Stop With Key Off | ||
| Key Switch Faulty or Shorted | Inspect key switch and test with continuity tester | |
| Cart operates normally in high range, with no speed difference in low range | Check Speed Range Switch connections | |
| Cart operates normally in low range, with no speed difference in high range | Check Speed Range Switch connections Check Speed Range Solenoids G and H | |
| Cart operates normally in high range, does not operate in low range, OR Cart operates normally in low range, does not operate in high range | Check Speed Range Solenoids G and H | |
| Front 3 batteries run down before the back row | Check Speed Range Solenoid H | |
| Back row of 3 batteries runs down long before the front row | Check Speed Range Solenoid G | |
Other Years and Models for The Harley Davidson Golf Cart
