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Why will my 1991 Corolla brake lights work when ignition is turned to AUX but not if the engine is running?

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βˆ™ 2006-07-28 17:39:56

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assuming all electrical is intact, and you didn't just have an accident or a new alarm installed or any major repairs that may have messed up the wiring... change the ignition switch... also, Everyone should have a manual for their vehicle, and a professional shop manual should be available at your local library for diagnostic procedures etc, just make copies of the right pages, as they are usually REFERENCE up and good luck :)

2006-07-28 17:39:56
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