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Temp gauge, goes hotter when I turn on the lights.

Posted by rkj 
rkj
Hey Guys and Kelly, So tonight as I'm heading down to sunset point I noticed when I turn on my lights (after the car has warmed up, and the gauge is reading in the middle) the temperture gauges goes up a fair amount. I'd say the jump was 1/16 inch. I know my original si batteries are probally shot and I guess this is proof, right?

Can't wait to take that rats nest apart! Can anybody run me through the process? Please....

Cheers, Rick 1988 325is/5 235K
It may only be a voltage difference due to the extra drain on the charging system...Might be as simple as a ground wire being corroded. Might come in handy on a hot day to cool the car by turning off the lights...(LOL).

Does the same thing happen with other electrical loads? Heater, brake lights etc? Perhaps a volt meter on the battery and monitor as loads are turned on and off. Might be a failing voltage regulator.

Bob in Everett



Edited 1 time(s). Last edit at 09/23/2012 11:51PM by Bob in Everett.
Quote
Bob in Everett
It may only be a voltage difference due to the extra drain on the charging system...Might be as simple as a ground wire being corroded. Might come in handy on a hot day to cool the car by turning off the lights...(LOL).

Does the same thing happen with other electrical loads? Heater, brake lights etc? Perhaps a volt meter on the battery and monitor as loads are turned on and off. Might be a failing voltage regulator.

As Bob said, probably a bad ground connection somewhere on the dash or instrument cluster. It acts like putting a resistor in series with everything. Watch out for corroded or loose connections, before pulling apart the SI batteries, not all evil in the world come from them!

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rkj
Hey Guys and Kelly,
Very good one! :clap:
Rick, Pelican Parts has an excellent step by step with pics for r&r SI batteries.

alan
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