Question about 1998 Mercury Tracer

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Battery light comes on when a bump in the road is hit.

Changed out to a new battery with same result. What should I bang on to troubleshoot the problem?

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Sounds like a loose connection to your alternator, check the plug and harness from the battery to the alternator. also check for loose terminals inside the connector to the alternator, make sure the terminals arent warped and bend into shape as needed. check for chafed wires or any alternator wires that could be contacting a ground causing a short. hope this helps!

Posted on Feb 21, 2009

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Suggest having the alternator checked. If that checks out good, then you have a short in the wiring. The only way to find the short is to check each wire seperately from the alternator to the battery. It will take time to do this, so be patient. Hope this helps.

Posted on Feb 21, 2009

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I suspect that the issue is a result of poor connections at the battery posts. Remove and clean the connections at both the battery + and - posts *AND* the + and - cable clamps / bolts with a small wire brush or a battery post cleaner. Next, mix a small amount of baking soda (1 or 2 tablespoons and 12 oz of water or so) and pour slowly over the top of the battery - do NOT allow it to enter the battery via caps or vents in the caps! Foaming is a sign of battery acid that has leaked on the battery and steals power for the battery much the way leaving a dome light on 24 hrs a day does. Rinse with water or garden hose thoroughly. After cleaning, apply an oxide inhibitor on posts and cable clamps (available at most auto-parts stores) or mix up vasaline & baking soda as shown in the video. Check that the fan belt that turns the alternator (yours may be a serpentine type - one belt for everything) is tight - not loose or otherwise slipping. Have it professionally checked / replaced if unsure.

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