rewiring a power trim tilt

[gsukopp]

I have a boat that had a 1994 60hp johnson with a 2 wire power trim on it. I just put a 1978 85hp Johnson on it with 3 wire power trim tilt on it. I cannot find a wiring diagram that shows me how to rewire the two relays to control the 3 wire trim. If I remove one of the relays it will function the other direction but with both relays it will move very slowly both directions but I know this is not right. Any help?

 

[dingbat]

I have a boat that had a 1994 60hp johnson with a 2 wire power trim on it. I just put a 1978 85hp Johnson on it with 3 wire power trim tilt on it. I cannot find a wiring diagram that shows me how to rewire the two relays to control the 3 wire trim. If I remove one of the relays it will function the other direction but with both relays it will move very slowly both directions but I know this is not right. Any help?

3 wire/2 wire tilt/trim

I am bidding on a used tilt/trim unit on Ebay for my 82 evinrude 115. It says it is a 3 wire. I believe mine to be a two wire. Other than that, it looks exactly the same. Will I be able to use the 3 wire on my boat? I was already planning on replacing the entire electrical box anyway as it...

forums.iboats.com

 

[flyingscott]

The older version on your 85 hp uses a solenoid not relays I believe.

 

[Chris1956]

The problem is that relays supply both ground and power to the PTT motor. At rest the relays provide ground to the PTT motor. when energized, they provide +12VDC to the PTT motor.

Your 3 wire motor has a center winding ground. With the relays, you are shorting half your motor's windings to ground.

I believe you can use the relays to control a 3 wire motor, if you can disconnect the ground from the secondary winding. You still need the primary winding of the relay to have a ground, but if the relay has 5 posts, it should be possible.

The other fix is to install 2 solenoids in place of the relays. A wiring diagram should be easily found.

 

[flyingscott]

It only uses 1 solenoid, it looks like a starter solenoid.