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ground, ground, world a-round Posted by Ari [Email] ![]() ![]() In Reply to: To all you electrical inclined folk..(Desperate), JustinHiFi ![]() |
Dollars to donuts you have a bad ground. Many different systems all connect to ground at only a few points in the car. Normally, the current flows through a switch to the light bulb of choice, then down into the chassis ground and eventually back to the battery. But if the ground point is bad, some (or all) current flows Back Up the line of some other innocent system that is sharing that ground point. That current will find ground eventually, it just will make this 'sneak path' through any bulb filament and relay coil it can find. Light bulbs don't care which way the current is flowing - they'll light up. And relays with diode suppression on the coils actually present less resistance to current flowing backwards.
It could be a short, but I doubt it. A short requires some insulation to wear away, and a connection made. A bad ground only requires a connection to become slightly undone. I see 100 bad connections for every unintentional one.
So find the common ground point, undo the bolt, clean up all the connections, and sock it back down.
OK, the big question is where is that common ground point? I'd have to check the schematics in a 900 Bentley manual, and I don't have one handy right now. From memory there are only a couple/three ground points in the dash/engine area. Find the ground for the turn signals and clean it, and I'll bet the rest works just fine.
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