Quote:
Originally Posted by chamilun
Well, it appears that if voltage drops considerably with "electrical components" all turned on, you have a bad alternator. I guess the ac kicking on simulates this scenario.
I want to make sure before I replace the alternator that a short is not a possibilty. The low (<13.5) output tells me it has a bad diode(s)
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Typically, if the VR diodes fail, the voltage goes high, and the battery get's cooked.
A lower voltage is most likely is the alternator.
Bentley's has a good chapter on this subject.
Have you tested the battery's specific gravity?.
Load test?.
V-Belt?.
Also, if possible, can you record the battery voltage, disconnect the battery overnight and re-measure the voltage in the am?.
The are several troubleshooting step you can take before "surgery".
Our alternator was completely rebuilt about 5K miles ago.
R&R(ing) the alternator was about a two hour job.
I'll take measurements tomorrow (static, running, running W/ A/C and lights,
and pm you.
Cheers,
Gerry