Question about 2003 Harley Davidson FLHTCUI Electra Glide Ultra Classic

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Battery drain, I just bought a new battery but for some reason it get drain if not plug into a tender. What could it be? Stater or regulator?

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It could be most anything including the new battery. Odds are that it's not the battery but never rule that out. I've bought a lot of bad batteries before.

But, let's do it this way. Disconnect all the wires off both terminals of the battery and reconnect only the large cable that goes to your starter on the positive side. Now, find the wire that runs from your voltage regulator back towards your battery. On some bikes this wire connects directly to the battery and on others it connects to the starter terminal where the battery cable connects. Disconnect this wire and reconnect any wires that were on the connector with it. What you're doing is isolating the voltage regulator. Now, touch the negative battery post with the negative cable. Watch for a spark. If you see a spark, something else is draining your battery. Now there are certain things that run all the time on your bike such as the ECM needs power all the time, the clock, and maybe a few other things. But if there's a rather large spark, it's probably something else. Also, if it's a large spark with the regulator disconnected, it's probably not the regulator.

Now, remove all the fuses from the fuse box. Remember what fuse goes where. Do the spark test again and notice the size of the spark. Start adding one fuse at the time and doing the test. When you put a fuse in that dramatically increases the size of the spark, your current load is more than likely on that circuit. You'll need a schematic to find out what is on that circuit.

If you don't like the "spark test" and want a more professional way of doing it, you'll need a DVOM (digital volt ohm meter) that will measure at least ten amps. Wire the meter in series with the negative post of the battery and negative battery cable. If the meter reads a negative number, reverse the lead connections.

Good luck

Posted on Sep 12, 2010


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