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6v System ground wiring question

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Hey Guys!

 

I have a '03 Carson Funrunner and after 6+ years of dealing with crappy 12v batteries I'm moving to 2 6v batteries. My question is with the grounding. Before I had 2 12v batteries wired in parallel. All cables came from the drivers side of the trailer and connected to the pos. and neg. posts of the closest battery.

 

The problem is that with the new 6v's, the ground cables are not long enough to reach all the way to the other battery.

 

There is a ground cable that went from the frame to the battery, I can easily relocate this to reach the other battery in the 6v system. Now the negative wiring from the trailer is my issue, it is too short to reach and I would rather not cut it and simply splice in a longer cable. So... can I ground these wires to the frame rather than the battery? I would use the existing grounding point for the battery to frame ground cable. 

 

I'm not an electrician, but I'm 99% sure this would work, just not sure if it is 'best' or even 'acceptable' practice. Please any input, below is a bad sketch I did, the top sketch is my proposal, the bottom is how it was wired before I removed the 12. batteries. 

 

Thanks for any input!

 

qrRP9Uc.jpg

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So long as you are using that frame ground point as a common connection, this will work fine without signal noise. Get the frame mounting area free of paint or contaminants, make a good solid clean ground there and then run that ground to the (-) side of your series wired 6v's. If you can, thru-bolt on the frame to get good clamping force on the connection.

Trojan T105/T125's are good so are the centennial 2200's.

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