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Discussion Starter #1
I am wondering if I have a bad ignition switch. I understand that the Temp Lamp is supposed to light up before starting the car to test the bulb and once the engine is running the light should go out. I also understand that the Temp Lamp is turned on by applying ground to the #3 terminal on the dash harness that is double wired (dark green wires). The first green wire goes to the temp sensor which applies ground in the event the sender gets to hot. That works fine. I think the other green wire goes to the the ignition switch which I am thinking should only apply ground just before starting the engine to test the bulb. I am presuming that ground should be removed from this wire after the motor is running which should turn the lamp off. However, the Temp Lamp never comes on during the bulb test and I have verified with a meter that the dark green wire never gets grounded.

I have already tested every circuit on the dash cluster to test for bad connections or burned out bulbs.

Could I simply have a bad ignition switch? I know I am being silly to want the Temp Lamp to come on during the bulb test cycle but this is literally the only thing that doesn't work on the car. If I get this working the whole car works. Can you imagine how cool that would be?????

Is there anything else to check before replacing the ignition switch? I suppose I am asking how ground is removed from the green Temp Lamp wire once the motor is running.

Thanks guys.
 

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Discussion Starter #3
I would expect the Temp Lamp to come on with the other 3 lamps during the bulb test cycle. Otherwise, why would there be a need for the 2nd green wire coming from the ignition circuit.

Does anyone know how the Temp Lamp is grounded to turn the bulb on before the engine is started? When the motor starts the Temp Lamp should then have ground removed to turn the bulb off.

Thanks in advance.
 

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Discussion Starter #4
It turns out that the TEMP LAMP does not turn on when the key is in the first position (ACC) with the other 3 lights (GEN, BRAKE, OIL). The TEMP LAMP comes on with the other 3 lights while cranking the motor. The two green wires do connect to the ignition switch and to the temp sensor on the block.

Everything on my car works now!! :beers: :hurray:

At least until I drive it the next time.
 
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