Once the master is on and the motor hi-amp breaker is in, power is available at the hot side of the intermittent relays that control power to the motor.  When the relay coil is powered through the gear switch and the pressure switch (lo pressure), a heavy disc in the relay is pulled down and the hot side is thusly connected to the motor side.  There is a tap off of the disc that is used to power the "pump in motion" indicator light.  Either the pressure switch is not shutting off the coil power that would release the disc or the disc is being bound up and is cockeyed so that the disc has power on it (thus the indication), but the disc is not in contact with the motor side.  Assuming no wiring anomalies.  Generally, both relays' "pump in motion" connections are routed to the single indicator light wire and this is why it is recommended that diodes be used to isolate each relay and that the wee little diode would burn out before a short in the indicator wire would have that wire try to carry 50 amps to ground and perhaps starting the wire on fire.

 

Scott Krueger

 

Hmmmmm, couldn't see which two breakers were pulled.  if both the relay coil breaker and the motor power breaker were pulled, there is a wiring problem to the indicator light.

 

Gents:

Haven't had time to look into this one yet.  

After takeoff, gear comes up but the hydraulic pump light stays on.

Breaker pulled (two of them actually) and light stays on.  (See below)

Breakers back in, gear down, pump light goes out.   (below)

Anyone else have this strange situation?

I have an electrically driven pump that reverses flow direction, one way for gear up, the other way for gear down.

Thanks/Regards,

John Hafen

IVP N413AJ 375 hours

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