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<blockquote data-quote="stones" data-source="post: 1029796" data-attributes="member: 540734">Some shitty alt shops will sell you a high output alt that needs a certain rpm before it will actually start to work, factroy alts are made to able to put out a reaonable voltage at idle.A good alternator shop would have understood your needs and sold you an HO alt that would still have decent output at idle.One option is to put a smaller pulley on the alt so it spins at a higher RMP at idle, this will shorten the life of the alternator a little though.I once was ripped off in the same exact manner, the alt would put out 180 amps at 2000 RPM(14.4v) but have around 35 amps at idle(11.5v), I tried the smaller pulley with limited success, the belt would slip because i only had a belt tensioner that didn&#039;t have enough tension to get the belt to grip.The first thing to check when buying a H.O. alt is the idling output.</blockquote>

[QUOTE="stones, post: 1029796, member: 540734"] Some shitty alt shops will sell you a high output alt that needs a certain rpm before it will actually start to work, factroy alts are made to able to put out a reaonable voltage at idle. A good alternator shop would have understood your needs and sold you an HO alt that would still have decent output at idle. One option is to put a smaller pulley on the alt so it spins at a higher RMP at idle, this will shorten the life of the alternator a little though. I once was ripped off in the same exact manner, the alt would put out 180 amps at 2000 RPM(14.4v) but have around 35 amps at idle(11.5v), I tried the smaller pulley with limited success, the belt would slip because i only had a belt tensioner that didn't have enough tension to get the belt to grip. The first thing to check when buying a H.O. alt is the idling output. [/QUOTE]

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