Posted by Hobo,NC on July 06, 2023 at 05:15:09 from (35.148.144.137):
In Reply to: Alternator problems posted by NHbalerman on July 05, 2023 at 18:29:25:
Blower motor on high 20amps
condenser fan 30 amps (you said evap?)
AC compressor 4 Amps
Ignition 4 amps
That don't leave much if any to replenish the battery and that is what its designed to do. Once the engine is started the alt replenishes the battery and the system runs off the alt.
That there tells us the alt is not efficient, not charging are too small to do the job.
58 amps, most all 10si alts come with a 63 amp stator so your alt drive (belt and pulleys) would have to be in top notch condition to keep up. Its doable but it would have to be efficient. We consider a alt that will put out 90 % of rated out put efficient so you are already in trouble. You have provided no useful info as to the alt. output. The condenser fan is killing you as they all do : ( but its a necessary part. .
Not knowing what tools you have available a voltage reading under all conditions would help to tell us the direction you need to go to resolve the issue.
I don't see a standard 63 amp alt ever living a happy life in your machine with the AC working at full blast. It needs a 90 amp alt and even then the drive system needs to be in excellent condition. 90 amps is asking more than a 1/2" belt can live under and that's an issue of its own, you are headed toward a double belt drive to get the best out of it.
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