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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

89 Ford Escort, Battery Drain Problems
Q: I have an '89 Ford Escort Four Door Station Wagon. The battery keeps draining when the engine is not running. I purchased a new battery about a month ago, and something in the electrical system is still pulling the battery down. I removed the fuses to the radio, Cigarette/Cigar lighter, Air Conditioner, and the cable to the Brake status switch located on the Master Cylinder. Still the battery drains. I also replaced the alternator. It was bad. However, I still have the same problem. If you have any clue what is draining the battery I will greatly entertain your suggestions on what may be causing this problem. It's driving me nuts. Other than this problem, the little car runs like a top. Has a really smooth idle when running......Carroll

A: There is a possibility of a sticking computer relay. You may find that suggestion entertaining, but it happens more frequently than you can imagine. The contacts in the relay that power up the computer will stick. Even with the ignition key off and all the fuses pulled from the vehicle there will be a current draw on the battery. The relay is hard wired with a fusible link into the electrical system; there are no fuses to pull. When a sticking relay is suspect, we will set up and monitor the electrical circuits powered by the relay to prove the problem. Another approach would be to unplug the computer relay while the vehicle is not being used. If the battery doesn't go dead you've found problem.

 
     
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