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Old 05-20-2015, 11:18 AM   #1
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voltage on ground

I have a 99 dsdp, and i have voltage on the ground going to the inverter/charger. It is a Heart Interface, has 6.40 volts on the ground cable when not connected to the battery. Is this feed back from something? Not connected to s/p

thanks Smoker
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Old 05-20-2015, 11:32 AM   #2
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The Heart inverter is an option I don't have on my coach.
But , and this my not be you problem at all, when tracing an electrical problem in my dash , nothing would work from the lighter socket, fuse was blown but still showed voltage at the socket.
Turned out to be feed back through the wiring from the solar panel , pulled the solar fuse and volts went to zero.
The panel provided enough volts to register on meter, but of course no amps. to operate anything.
Just for fun , pull the solar fuse and see if you still get a reading.
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Old 05-20-2015, 04:12 PM   #3
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thanks, i'll give that a try tomorrow.


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Old 05-21-2015, 12:02 PM   #4
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Voltage on ground

Skip426, wasn't solar panel, pulled the fuse and still had the same thing.

Must have something to do with the monitor panel, when the ground is disconnected there is no lights on the panel, hook it back up and everything seems o k.

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Old 05-21-2015, 03:15 PM   #5
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Are we talking chassis ground for the inverter, or the 3rd "ground wire" for the 120v output? Based on your comment about the inverter panel lights, I'm guessing 12v chassis ground. Normally there would be no voltage there - the operating voltage is between battery + and battery - cables; the chassis ground would not typically have voltage present. Something is using the chassis path to get to ground rather than the battery - (negative) cable.
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Old 05-21-2015, 05:00 PM   #6
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Voltage on ground

Gary, I just took the ground wire off of the inverter, and the voltage went away, but it has two ground wires and the second one has the voltage on it, but I haven't a clue where that ground comes from. All I know is that it goes behind the inverter/charger and it's rolled up, will have to remove the inverter to see where it comes from. Thanks for the input. will have to do more checking tomorrow or Saturday.

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Old 05-21-2015, 08:18 PM   #7
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This may not be a ground wire at all. It may very well be the battery temperature probe lead that was miswired to ground. Also, if your batteries, feeding the inverter, are dedicated to the inverter/charger only, the battery negative isn't always referenced to chassis ground. Just thoughts to investigate.
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