(Topic ID: 230031)

F-14 Coil locking on w/ mpu disconnected?

By megalo17

5 years ago


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  • 22 posts
  • 4 Pinsiders participating
  • Latest reply 5 years ago by megalo17
  • Topic is favorited by 1 Pinsider

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#2 5 years ago

Check the violet\green wire on the coil to see if it's grounded.

#4 5 years ago
Quoted from megalo17:

It's the right center eject. Snubber board has been removed and inspected. Resistor is shot, like most, but relay seems to be ok

Are you sure you have the correct snubber relay board? Post a pic of the snubber relay so I can see the wires.

#14 5 years ago
Quoted from megalo17:

690 ohms between purple/green wire and ground.

This is your problem, should be @ .600 meg of higher. Your diagram is correctly drawn, nicely done.
Test D-5 on the diode board, maybe its shorted.

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#15 5 years ago

If diode D-5 was to short then you would read low

Quoted from megalo17:690 ohms between purple/green wire and ground.
resistance to ground thru the flasher board resistors which connect to ground. Instead of the normal high resistance thru Q-31 and to ground.
This low resistance would be low enough to turn on the relay and energize the coil and burn the fuse just by turning the machine.

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1 week later
#17 5 years ago

I would have thought if the brown wire was the problem that the relay would not energize. What do you read on the purple green wire with it disconnected?

#19 5 years ago
Quoted from megalo17:

Purple green reads open when it's disconnected.

Disconnected from the relay board but connected to the diode board, correct?

#21 5 years ago

Sounds like a good plan.

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