That was the problem on my Cessna. I came across it quite by accident. I
had tried everything else to solve. That year Cessna used a single throw
- double pole pull switch. My ammeter started swinging and when I went
to touch the master it stopped. I found that I could start and stop the
wild swinging by slight rotational pressure on the switch.


-------------
Regards, Ross
C-172F 180HP
KSWI


Mike Noel wrote:
I'm not having any luck locating a new master switch for my '74 Archer, PN
99377-05 / 8911k619. I've got an intermittently bouncing amp meter and
suspect the old master is the culprit.