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Re: '81 323i Dash lights and tacho problem (archive)
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Posted by Karl Koenig on October 25, 2000 at 21:26:43:

In Reply to: '81 323i Dash lights and tacho problem posted by Chris on October 24, 2000 at 07:56:12:

Sounds like an open ground for the dash. So when your lights are off, clock and tach are grounded through the instrument lights. When lights are off, the leads to the lights are grounded through the switch, not open. But when you turn on the lights, 12V from that end keeps current from grounding that way.

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