Trim wiring problems

[Ddyof7]

I have an 80s 45hp mariner outboard factory without trim/tilt (stump jumper) i put a tilt pump off a 80s,90s mariner 60hp with factory tilt that works great. Problem im running into is when i hooked up tilt motor (3 wire) to side controller, my wires started melting while i was on river! Now, unsure if i need double relays, resistor or solenoid. Can anybody help? I know i can use an auto starter solenoid just need to ensure what all I'll need (inline fuse and what amp)

 

[dwco5051]

Here is a start to look at and get and idea of what you need;

 

[Chris1956]

A 3 wire PTT motor uses solenoids. Auto starter solenoids would work, but are not sealed, causing sparks in an area that could have gasoline fumes.

Marine solenoids are sealed, and I therefore recommend them. They will be available at most marine stores.

The switches on your control should work OK. I therefore suspect some sort of wiring problem. Likely you have wired one of them to ground, somewhere.

The diagram presented above is for a 2 wire PTT motor. It shows how the relays are wired. Your wiring diagram is much simpler.

Make sure black wire from PTT motor is grounded well. You will need heavy duty wires from battery plus to one secondary connections on each solenoid. You will also need to ground solenoids as well. Ground goes on primary winding.

UP Wire from control up switch (usually blue) goes to "UP" solenoid primary connection. Other secondary connection goes to blue wire on PTT motor.

DOWN wire from control Down switch (usually green) goes to "DOWN" solenoid primary connection. Secondary connection goes to green wire on PTT pump.

Some older PTT systems have a trim limit switch. They keep you from trimming the motor up too much under power. Usually the prop will ventilate before this happens. I would bypass it.

You might look on the maxrules web site for a wiring diagram.

 

[Chris1956]

Another thought on your melting wires. If you are using a 3 wire PTT motor and relays, you may be shorting half the PTT motor windings.

3 wire motors have the common ground in the center of 2 windings. Only one winding is energized at a time, and the other winding is supposed to be open. Relays would be wired to ground the unused winding.

If you are using relays and they have a thick and thin ground wire on each relay. See if you can disconnect the thick ground wire. That may unground the unused winding.