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Old 06-20-2010, 05:39 PM   #1
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gauge jump

We have 1990 Holday Rambler with 460 Ford. When headlights are turned on temp gauge jumps about 20 dergees . Any ideas?

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Old 06-20-2010, 09:21 PM   #2
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FWIW We had a 90 GeorgieBoy CruiseMaster, Ford 460, John Deere/Oshkosh Chassis-- Same thing. The change in voltage or load made a slight change in the gage indication. May be normal.....

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Old 06-22-2010, 03:09 PM   #3
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Our houseboat does this, it's simply due to resistance, caused by the large amounts of wiring used. Electric gauges use resistance to ground to move the needles. When more load is applied to the electric system and the voltage drops, resistance increases, and the gauges will read higher.

It IS normal because the lighting system eats a lot of power. Just not very desirable...
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Old 06-22-2010, 03:54 PM   #4
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Originally Posted by smallpond3500 View Post
We have 1990 Holday Rambler with 460 Ford. When headlights are turned on temp gauge jumps about 20 dergees . Any ideas?

Don't turn your headlights on...
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