Hi all, I ordered a new generator for my 67 Skylark and it showed up with a single track pully. The one on the car had a double track pully that off set the belt allowing the ac belt to run behind. I didn't see this as an option, is this essential, or will it work as is? I can't get either one off, so if I need to swap it out I'll have to take it in to shop. Also the belt ordered new as well, is a real pain to get installed. Any advice appreciated.
Dual pulley is usually for air conditioning cars. It can be swapped over. The store that sold you alternator may be able to do that. Belt may be too short if your having that much trouble getting it on.
Your year model uses alternator The first issue is how did you decide that your alternator has malfunctioned. Many years used the double pulley for both AC and non AC applications. I recall a 70 number ends with 1408. If you have an original unit, have it rebuilt. It already has the correct spacers for belt alignment. You can transfer the pulley and the spacers over. Use a leather glove and an impact gun.
Thanks for the help. Car does have ac so I will see about swapping over the pully. I don't think the original was on the car, but I suppose it could have been. Reason for replacement was a bad diode draining the battery. Gen light stayed on after the ignition was turned off. I pulled the alternator (Buick manual calls it an "alternating current generator") and opened it up. Tested the diodes and found the bad one.
A bad diode in the rectifier bridge circuit does not drain a battery. It keeps the alternator from recharging the battery as designed. The part number and date code is stamped on the case of original units.
Draining vs not charging, good to know, but it seemed to keep charge if I disconnected after driving. The one night I left hooked up was the day it didn't start. Coincidence? In any event, the battery which is new this year, was not strong enough to start the car. Aside from the pulley, is there some advantage to having the original rebuilt vs. buying a replacement? Aside from just having the original?
