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Old 02-09-2016, 11:28 AM   #11
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On most RVs, the negative battery lead goes to the chassis ground and the positive goes to the battery controller. Follow your leads and find the chassis ground, it shouldn't go far.
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Old 02-09-2016, 03:02 PM   #12
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Originally Posted by trbomax View Post
White is almost always neg.black or red is positive.Unfortuneatly there is no "code" for low voltage wireing,but what I stated above will cover 95% of any factory instalations.
Where white is used, that is true (assuming wiring was coded to begin with).

Marine and automotive standard is red = positive, and black = negative.

House wiring (120V): Black = hot, white = neutral, green = ground, red = switched (for 3 way switches, ceiling fans, etc).

RV wiring: who knows? Depends on what the installer had handy. The entire back side of my converter/distribution panel is white. The white wires are connected to an array of red, black and white wires with crimp-on wire nuts. As an engineer (electrical), I am absolutely disgusted. And yet everything works!

just my experiences
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Old 02-09-2016, 08:52 PM   #13
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What doesn't make any sense is if red = positive and white = ground, why is there no black wire for the negative... there are only 2 wires red and white on my trailer.

Rich
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Old 02-09-2016, 09:04 PM   #14
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What doesn't make any sense is if red = positive and white = ground, why is there no black wire for the negative... there are only 2 wires red and white on my trailer.

Rich
Ground is the same as negative in 12V systems. Only exception I know of is electrics by Lucas aka Prince of Darkness. Early MGs used Lucas and had positive grounds.
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Old 02-09-2016, 09:07 PM   #15
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Could there be a small wrap of black electrical tape on the white wire close to the lug that you overlooked?

Just went to look and there is a small wrap of electrical close to the end of the RED lug???
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Old 02-09-2016, 09:14 PM   #16
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Ground is the same as negative in 12V systems. Only exception I know of is electrics by Lucas aka Prince of Darkness. Early MGs used Lucas and had positive grounds.

Thank you pgandw for setting me straight on that, thought I was loosing it.
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Old 02-19-2016, 08:49 PM   #17
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At least you were smart enough to ask I blew fuses the first time I put battery back in wrong....
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Old 02-19-2016, 10:25 PM   #18
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brownie289 I bet you aren't the only one who has done that. However you might be the only one that's willing to admit your error.
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Old 02-20-2016, 08:04 AM   #19
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brownie289 I bet you aren't the only one who has done that. However you might be the only one that's willing to admit your error.
Now clearly marked w a sharpie marker in the box
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Old 02-21-2016, 09:09 AM   #20
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I took the battery out for the winter and now that I'm ready to install it, not sure which wire is the positive. I have a red wire and a white going to the battery box I would think that the red would be positive?? am I right
The fastest way I know is to find the wire that goes to a bolt in the frame. THAT (regardless of color) is ground. The other one (regardless of color) is "hot".

While you are there, you might consider removing it; wire brush the rust; and reinstall it.
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