Battery Replacement - Page 2 - Fiberglass RV

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Old 08-23-2012, 06:30 PM   #15
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Name: Raz
Trailer: Trillium 2010
Posts: 4,336
Hi John. It's common practice to tie one side the DC source to chassis ground. Use of a green wire is arbitrary. They can do it at the battery or the converter. Back in the good old days when electrical equipment was housed in metal chassis, tying all that metal together was a safety issue. With plastic cases that's not an issue any more.
The best reason I can give you is that it reduces the possibility of parasitic effects. An electrical circuit can behave as designed on the test bench, but installed, can behave quite differently due to long wires, proximity to other electronics, and a multitude of other things. For example, power supplies can turn into radio transmitters. That sort of thing. Good grounding reduces that kind of unwanted behavior. Will your DC appliances work without it. I suspect so. But if all of a sudden you LEDs dim or you get a fuzzy picture on you TV, poor grounding could be the cause. Raz

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Old 08-26-2012, 06:42 PM   #16
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Name: Ed
Trailer: 1994 Casita Freedom Deluxe 16'
Posts: 8
We bought a 1994 Casita in June and the battery was not only dead, but wired incorrectly. The previous owner assumed black was negative. The power center relay clicked constantly when we attempted to use battery power.

With a new battery and the black to positive and the white to negative, everything worked fine. There' s another wire, usually, but not always, green, that should run from the negative battery terminal out through the bottom of the battery compartment and connect to the trailer frame.

Apparently reverse wired batteries aren't uncommon due to confusion over the different color conventions used in RV wiring.

Hope this helps.

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