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I am looking for a three prong contactor master solenoid, or info on where I can purchase one.

George

Aircraft Spruce It is 4 prong but you just do not use one of them. Get continuos dute if it is the master solenoid

George I have one of THESE [aircraftspruce.com] (the 12v variety) if its what you are looking for.

I found it not to be quite heavy duty enough for my application. This one was not used and I don't have a use for it.

Assuming i can find it...You are welcome to it if its what you need.

That is the type I am looking for.
Let me know.

http://www.aircraftspruce.com/catalog/elpages/solenoidx610028.php

George this is the relay that can be legally installed in a certified aircraft.

Steve, the one on my plane has three poles, not four. That does not say that it was legal, there are no numbers on it and it is so old, it is almost a safety issue.

You can use the 4 pole one.

George, if your aircraft is wired up for a 4 post contactor, here is a link to a couple of service letters Charles posted some years back that gives authorization to substitute the three post contactor in place of the four post contactor.

Additionally, you'll need to wire it up like the later 150's in the service manual.

Thought he had a 3, I was saying he can use the 4 from aircraft spruce that can be used in certified aircraft.