I third the thought. I have a capacitor filter across the output of the
alternator and ground. I have also cooked an alternator in the summer .
The fan on the back was not enough forced air for a high load when it is
hot. I added a blast tube form the front of the cowling to the "Blast
adapter" on the back on the Alternator. The hole in my cowling just
below the engine air intake is for the alternator. Works great. No more
over heating problems.
Michelle

George Patterson wrote:

Jay Honeck wrote:

Of course, we have a new squawk shortly after coming out of the shop.
Perhaps someone here can point me in the right direction?


Alternator problem. Possibly a filter, but my guess is a diode is
going bad.

3) The noise slows down -- or speeds up -- in synch with the prop
RPM. At 2300 RPM, it's going a bit faster than once per second --
maybe around three times every two seconds.


Alternator speed depends on engine speed.

5) Adding load to the system (landing lights, fuel pump, etc.) makes
the noise louder. Adding load to the system and then suddenly
turning everything off makes the noise and amperage oscillation go
away -- for about 30 seconds. It then returns.


Adding load makes the alternator work harder. Cutting it all out lets
it loaf until the battery charge drops a bit, then the alternator has
to work again.

George Patterson
If a tank is out of ammunition, what you have is a sixty ton
portable
radio.