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Old 08-16-2015, 10:30 PM   #1
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Neg Ground Cables

I noticed I have two negative ground cables on my battery. What could be the reason I need two grounds?

Thanks
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Old 08-17-2015, 02:13 PM   #2
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For your 12v system, there may be a chassis ground, as well as an in coach ground of some sort that may be isolated from one another due to circuit design.
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Old 08-17-2015, 02:28 PM   #3
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Many trailers have more than one ground cable--mine has 3.
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Old 08-17-2015, 02:43 PM   #4
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Grounds are equally as important as the positive or hot side of any circuit. But we tend to forget that part so sometimes a coach builder puts in more to protect against those who don't service the grounds as regularly as they do the hot side.

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Old 08-17-2015, 04:15 PM   #5
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Quote:
Originally Posted by sd75mac View Post
I noticed I have two negative ground cables on my battery. What could be the reason I need two grounds?



Thanks

One probably goes to the frame. The other negative and the positive cable goes to your distribution fuse panel and converter.

In today's RVs the old frame ground is only for safety. All devices have a ground and positive supply ran to them. No longer using the frame for a return line. The ground return lines are all connected together behind the distribution panel.


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Old 08-17-2015, 06:36 PM   #6
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Thanks all, I will do some limited research on my TT since the underbelly is enclosed.
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