1995 Chevrolet Alternator Failures

CHEVROLET
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GRAMMAJ
  • MEMBER
  • 2 POSTS
Make is Chevrolet 1/2 ton 4x4 1995 with 155,000 miles. I have replaced my alternator three times in the past 6 months. The last time after replacing it it lasted a few days and when driving the truck the lights would dim and the heater fan would fluctuate. I have replaced the battery also. What could be causing this problem?
Jan 9, 2007 at 11:45 PM
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BACKYARDMECHANIC
  • ✓Experienced Mechanic
  • 337 POSTS
I suspect there is a short somewhere in the the wiring and the circuit that the short is in is not fused. If it was you would be blowing fuses. You need to test for a short in the system. For this test all you need is a 12volt test lamp and a wrench. Make sure prior to conducting the test that all accessories(hood and interior lights, etc) are off or you will get a false reading. Disconnect the postive cable from the battery and connect one end of the lamp to the battery and the other ot the postive cable you just removed. If you get a full bright light there is a short in the car. Now comes the hard part of locating it. I suspect the short is with in the engine compartment because some of these circuits are not fused. Start there and pull and wiggle wires and harness while observing the light to see if it goes on. When it does you have located the wire or harness that is causing the short. One last thing to think about, was anything electrical done on the car after the promblem started. If so looked there first. Good luck :roll:
Jan 10, 2007 at 12:15 AM

Suggested Repair

With all accessories off, disconnect the battery positive cable and connect a 12-volt test lamp between the battery positive post and that cable. A full-bright lamp indicates a short. Locate it by pulling and wiggling wires and harnesses while watching the lamp, starting in the engine compartment where some circuits may be unfused. Inspect any electrical work done after the problem began first.

Conversation Summary

The owner of a 1995 Chevrolet half-ton 4x4 has replaced the alternator three times in six months and also replaced the battery. After the latest replacement, the lights dimmed and the heater fan fluctuated within a few days. The expert suspects an unfused short and recommends a test-lamp check to confirm it, then tracing the short by moving wiring, beginning in the engine compartment and checking recent electrical work.

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