Posted by Guy(Utah) on Thursday, January 11, 2001 at 1:20PM :
In Reply to: I have a wierd M880 electrical problem too posted by Guy(Utah) on Wednesday, January 10, 2001 at 11:00PM :
Thanks guys for the input.
I'll just keep troulbleshooting the problem till I fix it. By the way, my wiring is in pretty good shape (my M880 never had the B/O lights installed,) I also have a Haynes wiring diagram and had pretty much determined the same thing Gary had. Here's a thought I had that I'll share with you guy's. I used to work for a printed circuit board manufacturer and a common quality defect would be shorts and opens in the circuits. I think I recall that a technique that used to be used for removing shorts was called a "hi-pot" test(or high potential.) The idea was that if you have a small thin piece of copper shorting out two traces, you can run some "relatively" high current between the two circuits and the current would fry the short but not be enough to harm the circuits. Well anyway, I think this practice isn't used much anymore because when the short is burned, it leaves carbon tracks behind. Over time this is supposed to allow little dedritic copper slivers to grow back and short the two circuits again. If this was done on my instrument cluster at the factory, I suppose that could be the source of my problem. I'm still scratching my head about this though because I examined the traces on the board pretty closely and I don't see any obious shorts. I'm sure that it isn't on an internal layer of the board because these boards are of a simple design and have no internal layers. Anyway it was just a thought I had. I think I'll probably go back and isolate the area of the short again to be sure that it is actually at the circuit board like I thoought. THanks again for the input.
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