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Old 11-13-2009, 03:53 AM
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Temp gauge moving when other switches hit.

I just got a battery for my caddy today, so it is the first time I got it cranking and was able to take a look at some of the electrical issues. The temp gauge, really more of an idiot gauge than a real gauge, will shoot the needle to one end of the gauge when I hit the power seat switch. The seat doesn't move, but that is not a huge concern right now. I don't know enough about electrical systems, but I figure somebody here should know what is wrong. I was smart enough to not leave the battery connected while it sits till I get this all figured out.

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Old 11-15-2009, 08:41 AM
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If you get a reading when you hit the switch, it usually means the gauge cluster is not grounded properly and its finding a ground through the seat switch. However, since its reading full scale when it has power, that also means the wire to the sending unit on the engine is probably grounded.

First look for an instrument panel ground wire up under the dash. Its probably connected to the emergency brake bracket, or some other bolt that is grounded to the frame.

Bruce
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Old 11-15-2009, 09:43 AM
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Thanks, I will take a look when I get a chance, I figured it was a ground but was not sure. The oil light is also on, but it is full on oil so something is hinky in the grounds(don't know for sure about pressure, have not had it running very long). I figure the fuse panel is screwed up and not grounded right, if it has a common ground. Electrical is one area where I am not real experienced and this car probably has several issues with the electrical system.
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Old 11-15-2009, 09:49 AM
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Check for blown fuses. There are a lot of electrical items in those cars and they are very prone to back feeds. I have seen some real weird stuff. In your case I would concentrate on the seat issue. Check all power feeds and all grounds for the seat. I would be willing to bet when you find the seat issue the gauge issue will go away.
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