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- sh410ExplorerA VOM will help. Put the VOM positive lead on the + post with the red cable hooked up. Put the VOM negative lead on the Black cable and if you see 12V+ on the meter then that is the negative cable. If meter reads zero then test the white cable.
- Greko6666ExplorerWell the says positive and black ground negative so it's only the white that iam not sure
- skipncharExplorerWhite is ALMOST always the ground wire on an RV. The black and red most likely BOTH connect to the positive side.
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