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Disconnecting the positive on the battery does nothing. If that theory is correct then you have to consider that everything is DC which means a positive and negative is required for all the electronics and if you don’t remove all the negative ground points to all the electronics there is still a...

Yes the ECM has a battery in it, I know because when it the battery in my ECM died I had to pay Caterpillar a lot of money for a new ECM and for them to reprogram it. When it happens it it causes a crank and no start situation.

I’ve welded on my LMTV many times along with welded on many other vehicles and equipment never disconnecting the batteries, sometimes even when the tractor is running. Never had a problem with electronics. Just be careful what’s on the other side of where you’re welding because the heat will...