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Old 10-11-2016, 11:16 AM   #1
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Welding - Electrical Concern

I am needing to weld some brackets to the bumper on our NorthPointe 341 and I'm not sure what I should disconnect/unhook before welding. I don't want to harm any of the electrical goodies in the camper. Is it enough to just turn the battery disconnect off, or, do I physically need to unhook the battery ground cable? What are your experiences with this situation?

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Old 10-11-2016, 12:18 PM   #2
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I've done lots of welding on motor homes and trailers without any problems. I always made sure the rigs were disconnected from shore power first just in case my welding ground lead came loose, I wouldn't put current through the rig ground. I use a 240V Miller MIG welder.


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Old 10-11-2016, 12:33 PM   #3
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Always disconnect the battery ground cable(s). That will prevent electrical current to be carried to the electronics.
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Old 10-11-2016, 12:34 PM   #4
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Leave the battery connected to damp out any possibility of spurious charges.

I agree on disconnecting shore power it eliminate any possibility of welding currents getting into the house's power system.

Other than that, the usual:
Make sure your work clamp has a good clean contact area
Cleaned all paint, rust, etc. from the parts to be welded
Protect any surfaces from sparks and hot slag
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Old 10-11-2016, 01:53 PM   #5
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I have several welding jobs done on my rig by professional welders. They used their own bonding system and I did nothing to my batteries, I was not on shore power.

Never a problem with anything inside.
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Old 10-11-2016, 02:16 PM   #6
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I jumped over to a few welding forums and the advise was about the same as here. Some say do remove the battery, some say don't.. You might want to do a google search for yourself and get a better answer.
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Old 10-11-2016, 02:36 PM   #7
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I think I would agree with Mike - leave the battery connected. It should act like a big capacitor and reduce *some* induced RF current. Even though that one loop would be eliminated, there are still many more inside still connected.
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Old 10-11-2016, 07:39 PM   #8
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I left my battery connected but disconnected from shore power and had no issues.

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