ELECTRICAL SYSTEM AND TESTING Electrical Circuits
1998/1999 PowerDrive Plus Vehicle Maintenance and Service Supplement Page 11-7
11
Battery Warning Light
The dash light performs two functions for the vehicle’s electrical system:
Warning Light: The warning light alerts the operator to any problems with the batteries or charging system. The
warning light will illuminate under the following conditions:
1. Battery no-load voltage drops below 48 volts.
2. Batteries have discharged more than 75% of rated capacity.
3. AC power is interrupted during the charge cycle (DC plug is still connected).
4. Charge cycle times out at 16 hours.
5. When the DC cord is unplugged before the charge cycle is completed, the warning light will illuminate for 10
seconds if the charge is less than 90% complete.
LED Light: In addition to the warning light, there is an infrared LED in the dash light assembly which transmits an
infrared signal from the OBC. This signal is received by the optional Communication Display Module which provides
information on the condition of the vehicle and batteries. See page 11-22.
Solid State Speed Control Circuit
The Control Circuit performs the following functions:
1. Monitors vehicle ground speed through the motor speed sensor.
2. Regulates vehicle ground speed by using the multi-step potentiometer to determine accelerator pedal position.
3. Activates the reverse buzzer when the Forward/Reverse rocker switch is in REVERSE.
4. Regulates direction of vehicle movement through the Forward/Reverse switch.
5. Activates the solenoids.
Tow/Run Switch Circuit
The Tow/Run switch performs the following functions:
1. Provides power to the key switch and the dash warning light when in the RUN position.
2. Provides power to the No. 18 white OBC wire when in the RUN position.
3. Deactivates the vehicle’s control circuit when in the TOW position.
THE POWER CIRCUIT
The function of the power circuit is to supply voltage from the battery pack to the motor. When regenerative motor
braking is activated, the power circuit will direct motor-generated current to either the batteries or the energy dis-
placement module, depending on the battery pack state of charge.
The Power Circuit consists of:
• Battery Pack (six eight-volt batteries)
• Solid State Speed Controller
• Electric Motor
• Solenoid Contacts
• Energy Displacement Module (Resistor Coil)
• All 6 Gauge Power Wires
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