8N alternator Pully

On your altinator, are you sure its a self exciting type? Some Delcos that have an internal regulator require a 12 volt feed into one of the terminals that the little plastic cover fits on. You feed it off your ignition switch so when the engine is on the altinator is exited. The only other thing I can tell you is if it is a self exciting type there is a small tab in one of the vent holes on the back of the case. If the altinator has not been run in some time you sometimes have to take a small screwdriver and touch this tab and the case(grounding the tab) to make it start to charge again. This ussually doesn't happen much. Its been so long since I've done it to one of these altinators I couldn't even tell you which vent hole its in. If I remember correctly its right near where the regulator mounts on the inside. The tab is just a little below the level of the case so don't go sticking a screwdriver deep inside while its spinning.

I'm using the pulley that came with my alternator and the larger belt with no problems. It works fine. I just finished replacing the idiot light that I bought for my conversion with the #194 light recommended by others on the list. The light I bought originally worked, but you had to rev the engine more than I wanted to excite the alternator. With the #194 bulb, it now excites just off of dead idle. Also finished replacing all the 6v bulbs with 12V. Now I'm ready to go!

brian

I'm also useing the pully that came on the alternator, I shimed the pully out from the fan so the belt would'nt scrub. It seems to work just fine.

later,dave

llater,

llamas

What you can't see in that pic,on the back side there's a small peice of band iron welded on the bracket going to one of the timeing cover bolts to keep the bracket stationary. I thought I had a pic, but for the life of me I can't seem to find it ! (-:

later,me

As far as the alternator not charging now, try revving the engine. The alternator may need the high rpm's to self-excite and start charging.

Good luck, Brian

I did put a larger pulley on a Delco. I went to Tractor Supply and picked up a sheetmetal pulley (don't recall what size) and just drilled out the center to fit. Any industrial belt/bearing shop can supply one. Check yellow pages under bearings. These guys are a great resource, especially for bushings and odd bearings.

JerryU

You're basically between a rock and a hard place here. The stock pulley (for a 1/2" belt) isn't really small enough to turn the alternator fast enough to excite it at low idle speeds.

If you replace the stock pulley with one of the same effective diameter but for a 5/8 belt, this won't change. If you get a pulley for the 5/8 belt but with a smaller diameter, you will be below the minimum radius for a 5/8 belt, per RMA specs. The belt will run hotter that it should and will fail quickly. You can help this by using a "cogged" belt but it's still less-than-ideal.

This is one reason why I prefer to use an externally-excited alternator for these conversions.

llater,

llamas