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Shacklaw's avatar
Shacklaw
Explorer
Aug 26, 2014

Electrified frame, dead batteries!!!

I have been away from this site many moons, and have been out of RVing pursuing other hobbies, but I am about to pull my 1992 Southwind out and start a "remodel". It has an issue that had plagued it when it was put away, and now must be addressed. I have decided to come back and tap into this wealth of knowledge!

Several years ago, I was moving the RV to our lake house. I was under the front (where the batteries are) and touched the frame with my arm, and got a shock! I was NOT on shore power, it was just sitting in the drive. I had charged the batteries because they were dead. It started, I drove it 100 miles, parked it. Within 1 day, all the batteries were dead. I figured I had left it sit a couple of years, that's what I get.

About a year later, I'm bringing it home, so I put new batteries in, 2 house and 1 chassis battery , leave it plugged into shore power overnight to make sure all is well. Next morning, all dead! I jump it, drive it in, kill it, won't start. I left it where it sat, but now Have to find out what is going on.

Nothing has been added or deleted. Nothing has been changed or rewired. Converter is humming (haven't checked voltage) but it acts like something is taking out power faster than the alternator, charger or converter can keep up.

There are SOO MANY SWITCHES, solenoids, relays for this and that, wiring for 120v, 12v, ahhhh! (not a wiring person!)

Where is the best place to start? Is there a "90% of the time it's this" sort of answer?

16 Replies

  • wcjeep wrote:
    You felt a shock while not connected to AC power? Sounds like an inverter creating AC power has a short to ground.
    Idling inverter will also run the battery down.
  • Pull out your digital voltmeter. Check from chassis to ground (metal stake in ground/water pipe in ground, etc) on both DC and AC scales.

    That will give you the FACTS. Then start pulling fuses/wires until the reading goes away.
  • You felt a shock while not connected to AC power? Sounds like an inverter creating AC power has a short to ground.
  • Ka Ron wrote:
    Here is an article that might help.

    This is a common problem with RV's

    Check out..........HOT SKIN A KNOWN PROBLEM


    Except he said he was not on shore power when this happened.
  • disconnect the batteries and check the hot side cables to chassis ground. If one of them is shorted to ground thats an easy place to start. You might have to follow the hot side, usually red, cables to where they end at a relay or the converter/charger or somewhere. Find the one that is shorted to ground to wherever it goes. foolow it. Very simplified but what you need to do.