[john67]

Hey guys, bought a powermaster 70 Amp three wire alternator for my 67. Installed it and started the car up and when I put a load on it,(headlights, electric fan etc.) it whines like a blower!!! Called Powermaster and they said that that was normal when a heavy load was placed on the alternator. Well, I've never had an alternator whine that loud. If you rev up the engine it goes away. I had allready ran a new 10 awg wire from the alternator to the battery. I even tried running a temporary 10 awg wire in addition to the one I allready have with no luck. Should I get a high output at idle one, or is this one just defected??? My old alternator (externally regulated) did not whine.
Thanks in advance,
John

 

[Tom Griffin]

I am using a powermaster 100 amp, it's quiet as a church mouse. Mine is a one wire, don't know if that makes any difference.
Tg

 

[DANNO]

I am using a powermaster 100 amp, it's quiet as a church mouse. Mine is a one wire, don't know if that makes any difference.
Tg

Ditto on my 72.

 

[kceb10]

make sure the altenator has a good ground try running a jumper wire from the alternator case to the -battery terminal. just an idea

 

[john67]

I'll try the ground wire, but my negative cable from the battery goes directly to the block. I would think with the alternator mounts attached to the block that that would be sufficent, but who knows???
Thanks for your help,
John

 

[BPeer1]

I have a Powermaster 140 amp 3 wire and it is quiet under load too. You don't have a loose fan belt do you?
BP