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Old 10-16-2019, 12:15 PM   #3
wingnut60
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Join Date: Sep 2005
Location: Where we park it
Posts: 2,838
To add to Jim's advice--top/bottom inspection includes taking the batteries OUT and having them load-tested. If these are original batteries, I would just get new ones....
dimming lights when other 12volt loads come on almost always indicates low battery charge. If on shore power, same deal--batteries can't hold a charge. And if you change the batteries, suggest sealed units to reduce corrosion on terminal connections.
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