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Ongoing Arrow alternator/charging problem
Hi everyone,
This group seems especially knowledgable, I hope you don't mind a question about a friend's plane. Its a 78 Arrow and is being used by a FBO for training. For the last month or so, they can't seem to keep the battery charged. Started a month ago and the alternator was found not putting out anything. Swapped it for a rebuilt alternator and two weeks later -- dead battery again. Same thing -- no output. Took the alternator back to the seller who tested it and confirmed that it wan't putting out. Bought a brand new one and installed it. Seemed to be putting out, but pretty low amperage except at high RPMs (Arrow has a load meter, not charge/discharge meter) . Exactly two flight hours later -- dead battery. Apparently, the alternator isn't putting out again. And the A&P is at a loss. I suspected the voltage regulator, but he says he's had it tested. Has anyone else run into a problem like this before? Or can anyone offer a suggestion on where to look for the root of this problem? I'd like to help him get this fixed -- we're both working on Instrument time and we're splitting the time between his Arrow and my Cherokee. Thanks guys... Chuck |
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