Trim motor

[Trike rider]

Checking the trim motor and found the motor has three wires one is the ground. Found that the motor runs constantly and there is power at the ground

 

[Scott Danforth]

and this trim motor is for a " "?

 

[Trike rider]

Checking the trim motor and found the motor has three wires one is the ground. Found that the motor runs constantly and there is power at the ground

It's a mercruiser 5.7 sterndrive. It will work if you put power to the up or down wires

 

[Scott Danforth]

motor has two windings. you apply green for down, blue for up. that is what the control relays do.

 

[Chris1956]

A 3 wire PTT motor will use solenoids instead of relays. These solenoids work the same a starter solenoids, that is, when energized, they supply power to one winding, and leave the other winding open.

Relays ground the winding, when not energized, which is bad for 3 wire PTT motor windings.

So check to make sure that you have solenoids, and that power only goes to one of them at a time, when the trim buttons are pushed. Also make sure the black wire is well grounded.

Sometimes when PTT motors are replaced, 2 wire PTT motors replace 3 wire PTT motors, and the solenoids are replaced with relays. That means that both types of motors could be available. Maybe the PO replaced a 2 wire PTT motor with a 3 wire PTT motor, and left the relays wired in?

 

[Scott Danforth]

A 3 wire PTT motor will use solenoids instead of relays. These solenoids work the same a starter solenoids, that is, when energized, they supply power to one winding, and leave the other winding open.

Relays ground the winding, when not energized, which is bad for 3 wire PTT motor windings.

So check to make sure that you have solenoids, and that power only goes to one of them at a time, when the trim buttons are pushed. Also make sure the black wire is well grounded.

Sometimes when PTT motors are replaced, 2 wire PTT motors replace 3 wire PTT motors, and the solenoids are replaced with relays. That means that both types of motors could be available. Maybe the PO replaced a 2 wire PTT motor with a 3 wire PTT motor, and left the relays wired in?

relays are a coil wound contactor that is used for switching power
a solenoid is a coil wound actuator that is used for mechanical movement

 

[Trike rider]

Would both solenoids be bad if power is going through both at the same time. Motor checks out

 

[Chris1956]

If power to both solenoids at the same time, likely the switch or wiring is bad. If power going thru solenoids when switch is off, I suppose both could be stuck, although I have never seen that.

That is not good for PTT motor either.