See On Board Compressor/welder for a vehicle. Can 2nd alternator be eliminated?
This instructable relates to this question . I can see the need for a second air conditioning compressor for that part of the build. With the alternator however, there is one under the hood already. Why not hack it to do two jobs.
Couldn't you just add back in the alternator parts you disabled in an external box and then with some wire and switches, alternate back and forth between welding and charging. The car can run off the battery for a while, so this should work.
Part 2 of this question is, the alternator in my case is in a Toyota Corolla. Toyota makes pretty tough stuff, however will my alternator make nearly, or as much juice as the Ford unit the guy recommends for the hack. I could swap in a Ford alternator I suppose, however it would likely require significant work to adapt the mounting bits. Thanks for Listening,