The Control Circuit - Club Car Gasoline Service Manual

General Information, Continued:
NOTE
• TO SERVICE THE ELECTRICAL SYSTEM, IT IS NECESSARY TO HAVE A CONTINUITY TESTER
OR A VOLT/OHM METER (VOM) CAPABLE OF READING FROM 0-48 VOLTS DC. THE VOLT
OHM METER (CLUB CAR PART NO. 1011480), CALIBRATION TEST MODULE (CTM) (CLUB CAR
PART NO. 1018871-01) AND CONTINUITY TESTER (CLUB CAR PART NO. 1011273) ARE AVAIL-
ABLE FROM YOUR LOCAL AUTHORIZED DEALER OR FROM CLUB CAR SERVICE PARTS.

THE CONTROL CIRCUIT

The control circuit consists of eleven individual circuits:
1. Capacitor Charge Circuit
2. Main Solenoid Control Circuit
3. Forward and Reverse Control Circuit
4. Controller Activation Circuit
5. Regenerative Braking Functions Circuit
6. Speed Control Circuit
7. Motor Speed Sensor Control Circuit
8. Dynamic Braking Solenoid Control Circuit
9. On-board Computer Control Circuit
10. Battery Warning Light Circuit
11. Reverse Buzzer Control Circuit
THE Z PLUG (FIGURE 21-5, PAGE 21-6)
Inside the solid-state controller there is a series of transistors that serve as on-off switches to activate or
deactivate many of the control circuits, and these transistors are connected to the electrical components that
they control through the Z Plug. The connectors in the Z plug are labeled (Z1, Z2, etc.) to identify which tran-
sistors they are connected to. The functions of these transistors are listed in the chart on Page 21-4 (Figure
21-4), and will be discussed in the paragraphs addressing the circuits and components to which the transis-
tors are applicable.
CAPACITOR CHARGE CIRCUIT (FIGURE 21-6, PAGE 21-7)
The capacitor charge circuit maintains a constant voltage supply to the three capacitors located inside the
solid-state speed controller. This is a very low current that keeps the capacitors charged so that the controller
can respond immediately when it is activated. This voltage, typically .8 (8/10) below full battery voltage, is
supplied to the capacitors even when the vehicle key switch is off, the forward and reverse rocker switch is in
neutral, and the accelerator pedal is in the fully returned (not depressed) position.
The Capacitor Charge Circuit consists of:
• Three capacitors located inside the solid-state speed controller.
• The 18 gauge red wire from the main solenoid small post to the Z1 terminal of speed controller.
• The Z1 transistor located inside the speed controller.
Voltage is supplied to the Z1 terminal of the speed controller through the red wire from the large post of the
main solenoid. See NOTE at the bottom of Page 21-6.
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Page 21-5