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High voltage warning light illuminates. Battery uses excessive water1. Regulator adjustment too high.2. Faulty warning system. Check over-voltage relay. 3. Faulty regulator. 4. Shorted cell in battery causing other cells to use excessive water. I received the following comment from a reader: Charge circuit would go to high amperage and high voltage limit (17v). System progressed over time, with initially after 1.5hr flying, progressing to start-up and after about 5 hours/5 flights. Alternator, regulator, wiring, condenser all checked out fine. Took battery into auto shop and asked them to check it. It checked normal on bench check. I asked them to check battery under load. Battery under load came back as \"excessive charge rate, battery overheated, replace battery\". I replaced the battery and system works normal. A bad battery is hard on your alternator since it tries to charge the
battery. The alternator brushes wear out quickly under the high charge load.
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