I know Jim is going to jump in here, but the starter solenoid should
have nothing to do with the ammeter woggle. I had the same problem on my
C-172F. This model has a single master switch that pulls in the main
solenoid and connects the voltage regular to sense the alternator. (Jim,
I hope I am explaining that correctly). This switch is a double poll
singel "pull" switch. Anyway, Cessna makes one of the crappest (is that
a word) pull switches. After some engineering we got it resolved. Every
connection in that circuit must me clean and no major resistance. The
old masterswitch had corrosion on the internal contacts. I could make
the ammeter do what I wanted. Before I discovered that, I cleaned every
electrical connection in the plane almost. What a job.

Ross
KSWI

scott moore wrote:

RST Engineering wrote:

A bit more information, please. What "solenoids"? Brush as in sweep
or brush as in graphite rubbing contact?

Jim


"scott moore" wrote in message
. ..

I was having a long standing problem on my 172N
with the ammeter "woggling




Sorry, I don't understand your reference (brush?). The solenoid referred
to on the 172 is what kicks in to operate the starter motor. Its
a mechanical relay.