104 alternator install
 

I have a 104 that has had charging problems for several years. It has a new V/R and the S/G tests OK. I am considering putting a 30 amp alternator on it and using the S/G as a starter only. I am concerned about getting enough RPM to let the alternator charge properly. The front pulley is a large enough diameter but the muffler is in the way of routing the belt on the opposite side of the motor from the S/G (the only place to mount the alternator). The rear pulley diameter is what concerns me. Has anyone had any experiance with this?

ive considered this option my self. keeping s/g to start and alt. to charge battery. I saw a very small alt.ithink the brand was denso.

My 100 would not keep the battery charged. Did a lot of stuff to it over a year. I recently bought a new S/G to put on my 100. Also had put a VR on it. No problems charging now.

Took the old S/G to an generator shop. They tested it and found that it would charge for 5 minutes, then the windings in the armature would open up, and it would stop charging. They replaced the armature and it works perfectly now.

It would start fine, but not keep the battery charged.

Cheapest fix is to buy a new generator. Usually $120.00, includes shipping.

An alternator will charge @ a much lower RPM. than a gen. one of the many reasons we went to it in the big 3 auto ind. in '63

Thanks for the advice. One thing I didn't mention is that I want to put lights on the 104 as it has none now. I primarily use it for blading snow and it is usually dark when I have time. An alternator should keep the lights from dimming since it will run the electric system a lot more effeciently than a generator. I've looked at some low amperage automotive units I can buy for less than $50.00 and some Denko ones that run $250.00. Being cheap, I will probably buy something made for a 1980s Japanese car. They are low amperage and physically small.

Denso used to make a little en, we used them on out hi/lows @ work,
thinking it is like 35-45 amps. they had Nissan 4 cyl.s in them.
I'm using one on the IH 400 loader tractor, and a nutter one on my 2 cyl 730 J.D.Diesel
You might go to an auto salvage yard, and look for little ferrin units, the older the better as they use huge 100Amp + units today to run all the
eeelectronicks. Ha,LOL!