I'm going to bite the bullet and do the 100 amp GM alternator conversion, and I'm having trouble finding one for a decent price. The link in the USRM goes to one that would cost me at least $150, and NAPA is more expensive than that.

 

I found a couple of alternators at Summitracing.com that look like the same case design, which they call a "GM 10DN". They are rated at 100 amps, and fit a huge number of Chevrolet, Buick, Caddy, etc cars from the 60's through the 80's.

 

Here's a picture of one of them, and I think it looks like the same one that was used in the USRM writeup. Can anybody verify that it's the same design?

 

Looks like a standard GM alt to me.

Well, I'd need to see the mounting ears on the other side to agree its a similar alternator. I've found numerous ones with similar mounting ears cloked at 8 and 2, however the width between the 8'oclock pair is different. The P7157 is the closest to perfect I found.

 

The part link on my writeup goes to a $75 alternator (p7157).. *shrugs* Theres a $35 core.. but whatever. Most likely its the same thing. Only way you'll know is to try it out.

kelly - hit the junkyards down there. Tons of chevy's in alaska. shouldnt be a problem. Get a used one, use it til it goes out (keep the subaru one as a spare) when the used GM alt goes out (if it does) bring that one in as the core for a new one

I just ordered the one from Summit. The one in the link from the USRM, with shipping and core charge, would cost about what I just paid for the alternator plus some other stuff I needed (exhaust wrap for my boat) from Summit. I had thought about picking up a used one, but there's no way to test it in the J-Y so it's a hit-or-miss deal there. I'll find out if this is the right alternator, but it looks like it's the same one. If not, no biggie, I'll fab up some brackets.