I, too, have just had the high voltage light coming on on my 1973 Cessna
172. Recycling the Batt half switch didn't reset the light.
So a mechanic is coming Saturday to check it out. I got my service manual
out and it said that the causes could be a defective overvoltage sensor, a
defective regulator, defective master switch, or associated wiring.
Doesn't necessarily mean the alternator is bad.
This happened to my C-182 back in the early 80s and it was due to a
defective stator wire in the alternator.
Tom Cummings
"John Clonts" wrote in message
...

"WinstonCup" wrote in message
...
I have a 1978 C182 Q. I recently experienced my alternator turning off
and the
high voltage light coming on. I cycled the switch (1/2 master) and got
it
to
reset every time, however, the interval between episodes varied. I had
the
Voltage Regulator and the Alternator replaced (new) and flew a couple of
flights since with no problem... until my last flight. Last flight it
happened
again. The Alternator switched off and the high voltage light came on.
I
cycled the switch and it reset.

What else is causing this? Is it a bad switch? Loose connection at the
bus?

Has anyone else experienced this and what was your solution?

Any feedback is appreciated.


We had some problems in this area with our C210. There is EXCELLENT
diagnostic information readily available at www.zeftronics.com. (once you
figure out exactly which "type" you have). Our "main problem" was a
failed
alternator (capacitor flopping around inside), but in the process we got
rid
of a voltage drop across a circuit breaker connection and/or master switch
which had been causing our ammeter to "pulse" for as long as we've owned
the
plane...

Good luck!
John Clonts
Temple, Texas
N7NZ