My starter solenoid was working when it felt like it (would work every twenty or so tries), so I got mad and broke down and replaced it. About a flying hour later, I started getting a whine in my comms, about like a teenager being told his allowance was being reduced. I figured the capacitor on the alternator was showing its age, so replaced it. Didn't help a bit.
Yesterday I was going to go shoot some touch and goes. As soon as I turned on the master switch the prop started to turn. "Hmm," I thought, "That ain't right."
I opened the oil door, and the first thing I saw was that the insulation on the battery cable had melted, and was too hot to touch. When I opened the battery box, the lead terminal on the positive end had melted and pooled on the top of the battery. Some kinda hot, I imagine.
Apparently, my new starter soleniod shorted out internally, allowing power to the starter at all times. The noise I heard was the starter trying to be a generator, and all the confused electrons generated enough heat to damage my components.
I replaced the battery (no Concorde immediately available, so Gill), replaced the positive cable, and put the old, intermittent solenoid back on until I can get a replacement. Whine disappeared, and everything else operated normally. Fortunately, nothing else was damaged. Off I went, into the wild blue yonder.
Now, if I could only remember how to make them damned 'squeaker' landings!
Edited by EdW (04/15/11 12:15 PM)