Question about 1978 Chevrolet Chevette

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I'm wiring two 12volt lights to 12 volt battery controlled by a illuminated 12 volt rocker switch with 3 terminals. I have both lights connected wired parallel to a terminal block. I then run one lead to the positive terminal of the battery with the other lead running to the switch and back to the negative terminal. That controlled the light, but how do I get the switch to illuminate. Please note I'm not familiar with electronic terms. Please use laymen terms

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Just put a jumper wire going from the 12v to the center terminal

Posted on Oct 07, 2009

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8_23_2012_9_53_22_pm.jpg

The IGNITION KEY SWITCH is connected by a small wire to the terminal in the GREEN circle on the SOLENOID. The battery is connected by a thick, heavy cable to the terminal in the RED circle of the SOLENOID. The terminal in the YELLOW circle of the SOLENOID is connected to a thick, heavy cable that goes directly into the STARTER MOTOR.

The -12 volts from the battery is connected to the car's engine, frame and body. The entire car has -12 volts available to all electric (and mechanical) parts, so only one wire is needed to energize those parts.

When the key is held in the START position, +12 volts from the battery is passed through the IGNITION SWITCH to the GREEN terminal on the SOLENOID. This causes the SOLENOID to (1) become energized, (2) internally physically connects the +12 volts RED terminal to the YELLOW terminal and (3) physically engages the STARTER to the engine's flywheel. When this happens, the +12 volts from the battery appears on the YELLOW terminal; and directly into the STARTER MOTOR. The STARTER MOTOR spins. Since it is engaging the flywheel, the flywheel turns too and the engine attempts to start. Once the engine is running, the key is released. The SOLENOID (1) becomes de-energized (2) opens the physical connection between the RED and YELLOW terminals, (3) disengages the STARTER MOTOR from the flywheel and the STARTER MOTOR stops spinning.

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The computer turns on the fan. Based on sensors from the motor.
DTC P0480 - COOLING FAN CIRCUIT

Circuit Description

The cooling fan is controlled by PCM through the fan relay based on inputs from ECT sensor, IAT sensor, A/C selector switch, A/C refrigerant pressure switch and vehicle speed sensor. PCM controls cooling fan by grounding cooling fan control circuit which turns on cooling fan relay.

The fan relay will be commanded on when ECT reaches 223°F (106°C) or greater, A/C is requested or vehicle speed is less than 38 MPH. Cooling fan relay will also be commanded on regardless of vehicle speed when a DTC is set requesting cooling fan to be on, ECT is 304°F (151°C) or greater, or A/C refrigerant pressure is high. Cooling fan may also be commanded on when engine is not running, on certain conditions.

Conditions for setting DTC:

Battery voltage greater than 9.5 volts.

Cooling fan fault line detects a malfunction for 6 seconds.

1. Check cooling system. Ensure coolant level and belt tension are correct. Adjust/repair as necessary. After repairs, go to step 23). If no adjustment or repairs were required, go to next step.

2. Turn ignition on, with engine off. Using scan tool, check if cooling fan is operating with ECT at less than 209°F (98°C). If cooling fan is off, go to next step. If cooling fan is on, go to step 4).

3. Command cooling fan relay on. If cooling fan operates, go to step 23). If cooling fan does not operate, go to step 5).

4. Turn ignition off. Disconnect PCM harness connector. If cooling fan turns off, go to step 23). If cooling fan does not turn off, go to step 6).

5. Disconnect cooling fan relay harness connector. Using a test light connected to ground, probe battery feed circuits in relay harness connector. If test light illuminates on both terminals, go to step 7). If test light does not illuminate on both terminals, go to step icon_cool.gif.

6. Disconnect cooling fan relay harness connector. With test light connected to ground, probe battery feed circuit in relay harness connector. If test light illuminates, go to step 9). If test light does not illuminate, go to step 10).

7. Connect a jumper wire between cooling fan relay battery feed and cooling fan battery feed circuit. If cooling fan operates, go to step 11). If cooling fan does not operate, go to step 12).

8. Repair open in battery feed circuit. After repairs, go to step 23).

9. Repair short to voltage in cooling fan battery feed circuit. After repairs, go to step 23).

10. Connect test light battery voltage and probe cooling fan control circuit. If test light illuminates, go to step 13). If test light does not illuminate, go to step 21).

11. Connect test light to battery voltage and probe cooling fan control circuit. Using scan tool, command cooling fan on. If test light illuminates, go to step 14). If test light does not illuminate, go to step 15).

12. With jumper wire still connected, disconnect cooling fan harness connector. Using test light connected to ground, probe cooling fan battery feed circuit. If test light illuminates, go to step 16). If test light does not illuminate, go to step 17).

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1 Answer

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1 Answer

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