That is exactly what my ammeter was doing. Then one day, while the
engine was running, I reached to turn the master off. I noticed when I
touched it and rotated slightle side to side that I could make the
ammeter rock solid or dance, as you say. I had already cleaned every
point of contact that I could get to in the electrical circuit.

Bob Chilcoat wrote:

On a possibly related subject, the load meter on our '74 Archer develops St.
Vitus dance about 25% of the time. Battery seems to charge fine, and you
can't hear any noise in the headphones, but the meter just jumps up and down
a couple of time a second. No one can figure out what the problem is. The
shop boys say that they see it a lot in Cherokees, and that they have seen
replacing the master switch cure it. Any other ideas?

--
Bob (Chief Pilot, White Knuckle Airways)

"Ross Richardson" wrote in message
...
On my '65 Skyhawk, I was having lots of problems with regulator/alt. The
Cessna designed switch is terrible. Contact resistance is too high and
if you look at the switch inside you can see wear and contamination. A
good military DPST toggle would be a good choice.

Larryskydives wrote:

Michael,

I had a problem on a 56 172 where the regulator went out after three
months.
We found that on the master, there were a set of contacts for the field
circuit that were bad. Replaced the master switch and no more problems.
May
or my not apply to you plane.

--
Regards, Ross
C-172F 180HP

--
Regards, Ross
C-172F 180HP