I learned something new today about 12 volt conver

I learned something today and thought I would share it with those who are interested.

I noticed my Jubilee project tractor had a dead battery, from what I assumed was lack of use. When I jumped it off the alternator was not charging (per amp meter). The battery was so dead when I removed the jumper cables the engine died. The 12 volt 3 wire GM alternator conversion has worked like a charm since I finished the restoration over a year ago.

At this point I assumed the alternator had gone bad so I took it back to the parts store and had them test it. They said it was good. I had the battery tested and it had a dead cell. The parts store prorated the battery warranty and I got another new 12 volt battery for $2.49. I reinstalled the alternator and put the new battery in and cranked it and it started charging like it did initially.

What I learned was that the 12 volt alternator charging circuit will not excite if the battery is sufficiently dead.

It’s nice to learn something new occasionally. I hope this helps someone else.

Best regards to all,

Rick

I used the GM side marker idiot light bulb for the excite circuit. I don't recall exactly how it is wired but I did a lot of research on this forum and others and got it right. I know it is right because, as I said, it has worked terrific.

HTH. Rick

Soundguy

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