I've done it on farm tractors but it's been awhile,I believe I used an older GM alternator and I remember there was something about it that I only needed to hook up one wire to it to charge the battery but I don't remember the details.A friend of mine that rebuilds starters and alternators suggested it and I just did it like he said and it worked fine.It was on a David Brown tractor with a Lucas electrical system,when the generator went bad,that's how we fixed it.:thThumbsU