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Alternator whine
"RST Engineering" wrote:
but I've got this friend Ernie ... Thats my dad... GRIN |
#12
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Alternator whine
On Mar 12, 6:17 pm, "Travis Marlatte"
wrote: "RST Engineering" wrote in message ... A coup'la questions & comments: 1. Why would you disconnect the battery to replace the alternator? I suspect it was in an attempt to reseat all connections that could contribute to the problem. I had already done this as well as "moving" all of the alternator mounting bolts. I didn't try any magic juice, however. 2. One presumes certain basic troubleshooting procedures prior to throwing parts at the problem, like back all heavy nuts grounding the alternator, squirt in a little magic juice, and retighten. I'll emphasize that I did my own diagnosis and concluded that it was an open diode. I took it to the shop not to have them diagnose but to swap the alternator - which they did quite well and it (or the process of doing it) solved the problem. ------------------------------- Travis Lake N3094P PWK We once had an alternator whine in a 172. The alternator wasn't the problem; there was a ground loop somewhere. After messing endlessly with ground straps and filters and other connections, I finally got fed up and ran the alternator using our table saw motor-- wheeled the saw up to the front of the airplane and used the belt to spin the alternator while I got under the panel wearing the headset and used a jumper to try grounding/ungrounding various jack points. Managed to minimize the whine by moving a groundpoint to a point where a bunch of other avionics grounded. Old airframes develop resistances at riveted joints, causing a voltage drop across certain components and introducing noise that's supposed to be filtered out in the radios or audio panel. I think. Anyway, it worked. Dan |
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