Welding On Class A, Do I Just Disconect The Battery ?

If you feel safer, by all means take a couple minutes and do it. I however have welded on both the truck and fiver without disconnecting and had no problems. A g ood ground near where your welding should be enough.

Yes I have read on welding forums to keep ground near where I am welding, however its a 50/50 on disconnect of battery ground, some say yes other say it don't matter.

Its not that much work to disconnect. Then your covered. I was just giving my own experience. Be safe.

If its a gasser...disconnect the battery. On a diesel....remove cables from the CPU's

My coach is very exact in the owner's manual on what to disconnect.

You could ruin a lot of expensive electronics if you do it wrong.

I'd be sure to unplug all electronics and protect the engine's computer as well.

Ground clamp close to where you're welding and you should be good. Welders put out a lot of current but at a low voltage. My MIG welder puts out 17v, only a couple volts more than you may see coming out of your engine alternator at times. Amperage isn't a concern either, a fully charged engine battery puts out a lot more current than a welder.

Did some welding on a lawn tractor and the ground was three inches from the weld and still blew up the battery.

Had a welder install the four leveling jack brackets last February. Used a heavy arc welder. I unplugged shore power and disconnected coach and chassis 12VDC using the disconnect switches. No problems with anything in the coach.