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electrical Problems


Guest Mniemann

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Guest Mniemann

Hi all,

 

New member here. I have a stock 78 280z. Everything running well until

last week. Car will not start. No click no nothing. All my electrical,

lights, radio,etc do not work. I had battery tested, and it is good.

I put in a new alternator. I just had put in a new starting motor.

I turn the key to on, and voltmeter goes to zero. If turn the key to

off voltmeter goes back up to 12. I am not sure what is going on.

Could this be my ignition switch? Need your help

 

Mark

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Guest Mniemann

thank you downloading now. Could it be my starting motor. As i said I just

replaced it, but would that have anything to do with no power to rest of car.

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Guest Mniemann

Working fine one day, and the next minute the whole car is dead.

figured since I had a new starter, and had the battery tested as good.

It had to be my alternator. I pulled it and had it tested and it was bad.

Got a Bosch for replacement. Hooked up. the car started,but if I did not keep my foot on the gas it died. I pulled the replacement and took back to

store to test. they said it was bad. They gave me a new one. I had them test it before I left, and it tested good. Put back in car, and now I get nothing, and no power to lights gauges,radio ,etc. I checked fuse box and fuses all are good, and checked the fusible links in engine. They are good.

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Guest Mniemann

78 has the regulator built into the alternator. Will pull the starter tonight and have that checked. if that is good will replace the ignition switch.

If that does not work will check relays.

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Guest Mniemann
Could it be a bad connection from the battery post to the battery wires? It can pull some power, but the resistance would cause the voltage to drop once the amperage goes up. V=IR

 

Okay, changed the gorund wire on back of the alternator. Car started right up, but know will not stay running if I do not keep my foot on the gas, and runs rough. I think I blew another diode in the alternator,

are these alternators that sensitive. Will pull again tomorrow and take down to parts store to see if it is bad. I had them test it before I left the

store the last time , and the alternator tested good. I cannot believe

what a pain this is.

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