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Harley davidson fat boy 2005

Something keeps draining the battery

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  • LennyL56 Nov 11, 2008

    76 harley,slow battery drain

    found coming out of the generator(four prongs)

    two had a slight groung,plugged in threw the regulator (wire going to battery)has a slight ground

    with wire disconnected from battery,voltage is recovering on its own

    What causes the problem???what has to be fixed??

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Regulator blead take ground wire off the reg and check volts between ground wire and goood ground shoud be less than 2.2 volts per h-d

Posted on Nov 26, 2008

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Every battery will loose some charge when its not in use. The first thing I'd do would be to put a voltmeter on the battery when its fully charged and then crank it up. If the voltage drops, you probably have a bad regulator

Posted on Aug 15, 2008

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You've got something that's pulling from the battery. It could be as simple as a loose connection or bare wire touching the frame, it could also be a bad relay, and this will generally show when testing for an open circuit. Check any added electrical devices. Also, keep in mind that the system on a Harley doesn't charge the battery, it only keeps it topped at where it's at. So, if you have a half charge on the battery, you can ride to Hawaii and back, and you'll still only have a half charged battery. This is where a battery tender comes in helpful for garage time. I'm afraid you're just going to have to start tracing wires, and checking relays.

Posted on Aug 14, 2008

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