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Originally Posted by fbodymustangdude
Hey guys I got a 91 caprice classic with a 305, 140k miles. The battery light came on ( the one to the left of the gauge cluster) and my lights started to dim while I was on the highway doing about 70. I was wondering if you guys think it would be the voltage regulator or this Alternator. Im hoping its the regulator because I dont want to spend 100+ on a new alternator.
Thanks for any adivce or input.
New to the forum
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Sorry, sounds like an alternator issue.
The armature has wires that pass through the steel pole pieces and the insulation surrounding these will eventually deteriorate and begin to fly out. When this happens, the wire will touch the pole piece and the the insulating varnish will chafe against the pole piece. It then shorts, causing the alternator to stop charging. This sort of failure makes itself known on highways at higher speeds, due to centrifugal force causing that wire to touch the pole piece. Around town, it'll work fine.
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