Hi, nice blog, I just listened to you on the survival podcast and came to check out your blog. I'm a welder/metallurgist , how many amps is your mig welder and what exactly are you trying to weld up , maybe I can give you a few Tips. Joe

Mark, I would be careful to ground the 4 wheeler during welding to keep any stray high frequency current from frying the electronic ignition. A battery cable over to the house ground rod would be good. If you can't do that, you might want to take the part off before welding. It might make it easier to clean the part and get a good weld. david from Alabama

I suggest you remove battery before welding. It can effect electronic parts. And you always need to make it clean before you use Mig welding. Unless you used stick welder.

I would agree with a previous comment. If you cannot safely ground it,take the part off and do the work. It will result in a cleaner job in any case.