Re: "95% of elec problems are bad grounds".... - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: "95% of elec problems are bad grounds"....
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Posted by John Myers [Email] (more from John Myers) on Fri, 25 Mar 2011 09:36:06 Share Post by Email
In Reply to: Re: "95% of elec problems are bad grounds"...., WB, Thu, 24 Mar 2011 18:38:02
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The positive/power side of an electrical circuit starts at the positive battery terminal. SAAB has been pretty good about keeping the always powered wires red. The electrons have to then do work, such as light a bulb or run a motor, before traveling back to the negative/ground side of the battery. Ground wires are mostly black.
The main ground is the negative battery connection to the transmission. It's large because the current for the starter motor has to pass throught it. Then there is another fairly large wire bolted to the fender. Cars use the metal body for the electrical path back to negative/ground. There are a dozen or more spots around the car where the black wires bolt to the metal car body. If any of these are loose or corroded it adds resistance and drops the voltage avaiable to the bulb or motor you want to power.
I reread your original post and the best way to find the problem is to use a wiring diagram and a volt meter. If the ignition switch has never been replaced that might still be your best starting point. When they go bad the dash lights are usually dim and then if you wiggle the key, they get bright again.

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