Question about 2001 Isuzu Rodeo

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Wiring when ever it rains or when i drive though a mud puddle, my my head lights will come on with out the truck running. i have to take out the fuse/transformer for the head lamps under the hood in order to turn off the head lamps, and also when this happins my rpm gauge's needle will jump back and forth from 2,000 and a little over 3,100, but the truck will still shift smothly, whats wrong?

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It sounds like a headlight relay gone bad. If the Tach wire was the problem it should not have power when key is off.

Posted on Aug 25, 2008

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