Question about 1987 Jeep Wrangler

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When my 1987 Jeep Wrangler is cold, and at an idle the tac stops working , and the ammeter shows a negitive charge, and then the belt squeals. Once it warms up it seems to correct it self for the most part, The Tac will only go to 2500 before it begins to jump around. Is there a colation between the charging system and the tachometer. The problem with the squealing belt begn after the lights were left on and the battery died.

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You need to have the alternator checked. The tachometer runs off signal from the distributor, but can be indirectly affected by the charging system. It may be as simple as tightening the alternator belt, but I would guess that the alternator itself is going bad. Alternators that are marginal in charging ability anyway (old) may just go bad under the load of charging a fully dead battery.

Posted on Mar 24, 2011

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