Charged batteries-Overnight drain

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Charged batteries-Overnight drain

Home > Discussion Forum > Mechanic's Corner - Electrical

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All Messages in Thread	Author	Date
Charged batteries-Overnight drain	Ed	11-28-07
1981 winnebago 454 chevy.Last night I charged all three batteries,checked with a meter, all three are good held charge.Cranked up engine started no problem,Fired up the generator, no problem, all appliances working fine.This afternoon the engine started right up,pressed main on the volt switch, just under 12 volts. Tried to start generator,wouln't start check volts on aux switch it just moved a bit,coach lights very dim.Started engine pressed dual switch,15 min lights started getting brighter and gen wanted to start.2 12 deep marine bat, need help to locate drain. All appliances,fans,lights were off.
Re: Charged batteries-Overnight drain	mike	11-30-07
Ed it sounds line a drain on your house batteries. Get a simple test probe with a small lamp in the handle at a NAPA or auto parts store. Spend afew bucks and get a good one, 8 to 10 bucks. It will be a good thing to keep in the RV when camping.Remove the pos.cable to the house batteries.Connect the test lead wire to the cable you disconnected. Connect the other end (probe tip ) to the battery positive post. The light will light up if there is a drain out of the battery. Now remove one fuse at a time from the converter panel where your 12 volt wiring is. No need to mess with the 120 vac fuse or fuses. Just un plug the AC power cord when testing to have only 12 circuits active. When you find a fuse that makes the light go out you will know what circuit is draining the battery.It most be a drain of a few amps for the battery to go down that fast. Have the batteries been load tested? Good Luck and make sure the 120 volt circuit is not on when testing MIKE
Re: Charged batteries-Overnight drain	lhyzer	12-2-07
Also run a specific gravity check on both batteries.You can pick up a tester at any auto parts store.