ELECTRICAL SYSTEM AND TESTING
Test Procedures
Page 11-32
2005 Precedent IQ System Electric Golf Car Maintenance and Service Manual
11
Test Procedure 9H – Pin 12, Continued:
6. Place the Tow/Run switch in the RUN position and the key switch in the ON position.
7. The solenoid should click when the key switch is placed in the ON position.
8. If any other activity is observed, check the following items:
•
Continuity of the wires in the wire harness
•
Reverse buzzer for proper operation.
See Test Procedure 16 – Reverse Buzzer on page 11-37.
•
Tow/Run switch for proper operation.
See Test Procedure 6 – Tow/Run Switch on page 11-19.
•
Key switch for proper operation.
See Test Procedure 8 – Key Switch and MCOR Limit Switch Cir-
cuit on page 11-20.
•
Solenoid for proper operation.
See Test Procedure 14 – Solenoid Continuity on page 11-35.
TEST PROCEDURE 10 – ONBOARD COMPUTER SILICON-CONTROLLED
RECTIFIER (SCR) CIRCUIT
See General Warnings, Section 1, Page 1-1.
The silicon controlled rectifier (SCR), located inside the onboard computer, acts as a switch on the negative
side of the circuit.
This allows the onboard computer (OBC) to control the battery charging current.
Use the following procedure to test the SCR:
1. With batteries connected and using a multimeter set to 200 volts DC, place the red (+) probe on the pos-
itive post of battery no. 1 and place the black (–) probe on the charger receptacle socket that has the
black 10-gauge wire attached to it. The reading should be approximately 36-42 volts.
2. If the reading is zero volts, check the black 10-gauge wire connection to the OBC connector. Check the
continuity of the black 10-gauge wires. If the wires and connections are okay, the SCR has failed.
Replace the OBC. If the reading is correct, proceed to the following step.
3. Plug in AC and DC cords. When the battery charger relay clicks on, reading should be approximately 48
volts (full battery voltage). If the reading does not rise from approximately 40 volts to full battery voltage
when the DC cord is plugged in and the relay clicks on, check the following items:
•
Black wire terminal socket in the charger receptacle.
Figure 11-17 Pin 12 Test
SPEED CONTROLLER
