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Weird cluster idiot lights behavior 200 1982

posted by  Rolandp on  Sat Sep 5 16:12 CST 2020
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last visit: Wed Oct 15 17:36 CST 2014
[RELATED]

This morning started the car as usual and no cluster light came on. This a 240 1982 dl with B21A engine.

Here is what I did and tested - with cluster fuse 13 ok (12 .5 volt), engine stopped and switch on KP11:

- no battery idiot light

- no brake failure light

- no bulb failure light

- oil pressure light on

- parking brake light on

- chime working with door open

- started engine, no charge, stayed at 12.5 volt, I tried to exite the alternator using a 1.5 watt bulb at the alternator, still 12.5 volt.

- tried 4 other spare bulb failure sensors with same part number, 1235271 which was the original one. No change.

I replaced the alternator with anew reconditioned one and started the engine. Voltmeter shows 14.1 volt.

Engine stopped and turned switch on KP11,

- no battery light, no brake failure light, no bulb failure light.

Started engine. I noticed that alternator hesitate one second or two before the voltage get to normal 14.1 volt.

I wonder if the cluster board has damaged diodes which could cause these idiot lights not being tested with switch at position KP11.

Brake failure, bulb failure lights being defectives does not bother me that much. But battery exciter light worries me very much. I am afraid the alternator could very well not charge sometime without that small voltage.

I could replace damaged diodes if it is the case. Or connect a temporary exciter bulb direct on the alternator so I don't get stranded.

Thanks for your suggestions.





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