JonJay
Well Known Member
Looking for any ideas to what might be causing my alt. field breaker to trip. It only happens when engine is warm, ambients are above 60f or so, and only when on the ground during taxi. I can reset the breaker after only a short time in the air and it operates fine during flight regardless of OAT or OT ( 100f OAT yesterday, long taxi, 210f oil and I was still able to reset it after only a minute or so in the air)
I flew with the same configuration for 400 hours before this problem crept in.
I have done the following:
Changed alt. from Nippo to PP
Rewired alt. field from #18 to #16 awg
Isolated alt. field circuit directly to bus with new 10A breaker. (was on DC load Center)
Replaced alt. field switch.
Checked all ground wiring and engine ground.
The only item I changed that the timing corresponds with are adding an oil shutter to increase my oil temps. My alt. field wiring is bundled with my Alt. main line and other ff wiring with adle clamps off the sump. So, it is probably hotter in the lower cowl than before from higher oil temps but I am not buying that as the problem.
There is some low level crackling static in the headset usually right before the breaker trips.
Calling PP tomorrow. Looking for ideas here from the "experts".
I flew with the same configuration for 400 hours before this problem crept in.
I have done the following:
Changed alt. from Nippo to PP
Rewired alt. field from #18 to #16 awg
Isolated alt. field circuit directly to bus with new 10A breaker. (was on DC load Center)
Replaced alt. field switch.
Checked all ground wiring and engine ground.
The only item I changed that the timing corresponds with are adding an oil shutter to increase my oil temps. My alt. field wiring is bundled with my Alt. main line and other ff wiring with adle clamps off the sump. So, it is probably hotter in the lower cowl than before from higher oil temps but I am not buying that as the problem.
There is some low level crackling static in the headset usually right before the breaker trips.
Calling PP tomorrow. Looking for ideas here from the "experts".