Clicking tilt trim and now blowing fuse ? 50 Mercury 2 stroke

[bray81]

I have a 50 hp 2 stroke Mercury 91 model
I have a clicking coming from motor dept, I replaced relays
didn’t fix the issue, new battery in boat fully charged
I’m still hearing clicking selonoid? But now the 20 amp fuse is blowing ?
What do you guys think ?

 

[markhodges78]

Pump locked up or bad motor possibly..does it do it up and down. ?

 

[QBhoy]

Got to agree with the above. It can only be down to the motor being bad, the rams stuck, you’ve got the locking arm engaged, if you’ve ruled out the electrical side and that’s all good. Does the engine move when you open the vent release screw a turn or two backed off ?

 

[Chris1956]

I am pretty sure that a '91 would originally have a 3 wire PTT motor and solenoids.
Jumper the PTT motor directly from the battery and see if she turns. If so your wiring or relays/solenoids are suspect. If the motor has a black, third wire, make sure that is grounded well, prior to jumpering.

For those who don't know, solenoids provide power to the PTT motor when energized, and are open when not energized. Relays provide power when energized and ground when not energized.

3 Wire PTT motors have two distinct windings, with a center ground. One winding is for up and another for down. Solenoids provide power to one of those at a time.

2 wire PTT motors have a single winding. Relays are grounded in their idle state and when energized, provide power to one side of the 2 wire PTT motor. The PTT motor can spin in either direction as the relays reverse the current flow.

if the original PTT motor was replaced with a two wire type, relays should have been used on the newer 2 wire PTT motor.

If the PTT motor is bad the replacement PTT motor could be either 2 wire or 3 wire. If you are replacing a 3 wire motor, you will need a new wiring harness and relays. These often come with new PTT motors, but you need to check.

 

[QBhoy]

I am pretty sure that a '91 would originally have a 3 wire PTT motor and solenoids.
Jumper the PTT motor directly from the battery and see if she turns. If so your wiring or relays/solenoids are suspect. If the motor has a black, third wire, make sure that is grounded well, prior to jumpering.

For those who don't know, solenoids provide power to the PTT motor when energized, and are open when not energized. Relays provide power when energized and ground when not energized.

3 Wire PTT motors have two distinct windings, with a center ground. One winding is for up and another for down. Solenoids provide power to one of those at a time.

2 wire PTT motors have a single winding. Relays are grounded in their idle state and when energized, provide power to one side of the 2 wire PTT motor. The PTT motor can spin in either direction as the relays reverse the current flow.

if the original PTT motor was replaced with a two wire type, relays should have been used on the newer 2 wire PTT motor.

If the PTT motor is bad the replacement PTT motor could be either 2 wire or 3 wire. If you are replacing a 3 wire motor, you will need a new wiring harness and relays. These often come with new PTT motors, but you need to check.

Excellent info. Well said. Can I add that it’s likely a good idea to test the relays are on spec. Generally across the serving terminals (usually something like 85 and 86 stamped), the acceptable ohms reading might be given as about 85ohms +/- 10ohms at the most or probably less.