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post #4 of (permalink) Old 22nd December 2007
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Quite possibly as almost every bit of wiring in a car has a common earth connection. 99% of times when things start operating when another switch is operated its down to the loss of an earth connection. The most common one is brake lights going off and on when indicators are operated. If you do a search on ‘Earth connection’ on the ‘search’ option at the top of this page you’ll see what I mean.
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