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Old 01-18-2019, 05:16 PM   #1
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Wink Battery Polarity Again

I know this comes up quite a bit, but I thought I would report a new twist (to me) on my 2019 Grey Wolf 20RDSE. Not thinking about it I removed the battery to take home to keep charged in my garage. White is always ground on the RV, right? The other day I was at the camper and realized I had no white cable, only red and black. Crawling under I found the black battery lead was attached to the frame. Attached to the same bolt was the white ground leading into the TT. That makes the red the hot wire and black the neutral. Are we all getting confused yet?
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Old 01-18-2019, 05:25 PM   #2
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Your 12 volt side is more like what you would be used to seeing in a car or truck. Their batteries are wired red for positive and black for negative as well. RVs can get a little confusing with the combined 12v and 120v system.
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Old 01-18-2019, 05:36 PM   #3
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One general rule of thumb I use when working on RV 12V DC systems is always check with a meter or visual as I have seen many wiring color combinations. I always recommend that anyone removing a battery clearly mark both cables BEFORE removing them from the battery.
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Old 01-18-2019, 05:42 PM   #4
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One general rule of thumb I use when working on RV 12V DC systems is always check with a meter or visual as I have seen many wiring color combinations. I always recommend that anyone removing a battery clearly mark both cables BEFORE removing them from the battery.
So "White is always ground on the RV, right?" Nope. I try not to use the word ALWAYS when talking about RV assembly.
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Old 01-18-2019, 05:51 PM   #5
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One general rule of thumb I use when working on RV 12V DC systems is always check with a meter or visual as I have seen many wiring color combinations. I always recommend that anyone removing a battery clearly mark both cables BEFORE removing them from the battery.


Out of curiosity... how do you figure out positive vs negative with a meter?
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Old 01-18-2019, 06:12 PM   #6
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Out of curiosity... how do you figure out positive vs negative with a meter?
If powered measure voltage if not measure connectivity/ resistance to frame/ appliance.
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Old 01-18-2019, 06:39 PM   #7
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Out of curiosity... how do you figure out positive vs negative with a meter?
The meter has black and red leads. Black is negitive. reverse them and you will get negitive volts.
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Old 01-18-2019, 06:51 PM   #8
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Never assume a certain color is + or - esp on RVs I have seen it both ways.



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Old 01-18-2019, 07:47 PM   #9
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Out of curiosity... how do you figure out positive vs negative with a meter?
On 12 volt DC and 120 volt AC the power will flow through the meter will indicate a positive symbol or a negative symbol. The only circuit showing full voltage is the positive one.
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Old 01-18-2019, 08:33 PM   #10
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Thanks everyone.
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Old 01-20-2019, 06:57 PM   #11
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Amazing

I just noticed on the trailer frame near the battery there is a sticker stating that the red cable should be connected to positive and black to negative. How many campers have suffered damage because the manufacturer couldnít be bothered to place a sticker there? Thank you Grey Wolf!
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Old 01-27-2019, 07:09 PM   #12
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battery polarity

As a general rule, DC ( battery) ground will be black and AC(115 V) will be White.
GENERALLY!!
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