Ok I have finally accomplished two goals. 1 I made a onboard air compressor to run impacts, inflate tires etc and have it mounted under the hood of my ford p/u using an old York ac compressor and a air can from a semi rig to hold the compresed air. I ran a impact for thrity minutes and it never bogged down. I can get 200 psi out it in about 15 seconds. 2 I just finished making a homemade welder out of an old 100 amp gm alternator and also have it mounted under the hood. (of course separate from the alternator that actually runs the truck) So I can weld and use air tools off what I have under the hood of my truck for a total cost of about 120 dollars. Now I am reading 90 amps on the welder at the rod. How can I or can I somehow convert this to a generator as well? Like to run regular stuff IE lights electrical items etc? Also how much could 90 amps be in wattage? How would I hook it and to what to make it useful as a generator?