Hi Michelle,

Thanks for your tip.

Please can you explain in more detail the voltage drop method? I am new
to aricraft maintenance. Where am I measuring the voltage drop? Between
the terminals of the battery?

I take it I need to have the alternator being driven...probably by an
electric motor or something? And then check that each connection is
secure while monitoring the voltage across the battery?

Dave


Michelle P wrote:
I have said it before and I will say it again. Check the ground
connections. Check Alt to engine engine to Air frame and airframe to
battery. Use the voltage drop method, not resistance.
Michelle

Dave wrote:

Hi people,

Our PA28 has developed a problem. The Low Voltage indicator keeps
coming on. The engineer has replaced the Voltage Regulator which didn't
solve the problem at all. Then he changed the Overvolt relay. I flew it
for 50 minutes with no problems and then the next time I took it up
(some days later) the light came on within 10 minutes of takeoff, then
7 more times in the 1 hour flight.

It comes on at seemingly random times and can be reset by recycling the
alternator switch. Sometimes it stays off for 10 minutes, sometimes
half an hour (which makes tracking down the problem even harder!)

Any ideas?

Dave