B42 Gasser

[markpwhit]

Looking for some help. I have heard in the past that the alternator will not kick in until the truck is run at a higher rpm for an extended amount of time. I had it tested and it came back okay. Put new battery in it and ran it at idle for a extended amount of time and the battery went dead.

Will the alternator charge the battery at a idle speed.............and the truck came as a positive ground system.

Any help would be appreciated.

[Bigdogtrucker]

If it has a gen. on it you'll have to rev it a tad to get her charging.

[markpwhit]

If it has a gen. on it you'll have to rev it a tad to get her charging.

Thanks for the reply. It is definately a alternator with no generator. Will keep probing.

Thanks again

[BOB DINGSDALE]

altinaters charge at idle thats the advantage of them

[leversole]

A single wire alternator needs to turn about 1000 rpms to "cut in"...that is alternator RPM, not engine idle speed! On my B model, I have to rev the engine to get the alternator to cut in, then it charges (at a reduced rate) at all rpms...

[Dougsr]

A three wire GM alt will kick in at a low idle.

Doug

[markpwhit]

A single wire alternator needs to turn about 1000 rpms to "cut in"...that is alternator RPM, not engine idle speed! On my B model, I have to rev the engine to get the alternator to cut in, then it charges (at a reduced rate) at all rpms...

Thanks for the feedback. It is a single wire - what kind of engine RPM do you run yours too kick it in?

Also - is your B model a positive ground system?

[leversole]

My B is negative ground...dont know the exact RPM...I just blip the throttle to 800 or so (alternator pulley is overdriven) and the alterator light goes out and shows a charge on the ammeter