Trim Function for Yamaha 90 Four Stroke

[boscoe99]

OP seemed to be trying to differentiate between the relay being faulty or the pump motor being faulty.

The test above confirms that the pump motor is faulty or not. It does not indicate where a fault is within the pump motor. That is the subject of further trouble shooting.

Someone that is not fully conversant in trim and tilt systems, and whom simply wants to get back to boating, is more than likely just going to replace the defective pump motor with a good pump motor.

 

[Mark R.]

If you have disconnected the PTT pump motor power feed wires at the relay, and applied battery power to the leads, and the pump motor does not run, that is a pretty darn good indication that it is the pump motor that is at fault.

Yes. There are only two leads coming from the motor. So am I correct in my assumption that the relay switches the +/- polarity to make the trim motor spin in either direction?

 

[boscoe99]

I do plan to play around with it on the bench once I get it removed.
Honestly, though, it looks like the motors are not killer expensive.
The boat is up on a lift at my dock, but I can't quite reach the motor.
So I'm gonna need to pull it from the water in order to get it removed.
I'm not sure how much confidence I would have in my repair effort.
It might be more prudent to just go with a new motor. We'll see...

Generally it is easiest and fastest to remove the complete assembly from the motor. Then take it to a bench to remove the pump motor.

Either replace the motor with a new one (OEM or aftermarket) or open the pump motor up to see what may be the problem. Could be the brushes, the over temperature relay, or wiring to and from same. Those parts get pricey very quickly.

On a ten year old motor I would replace it with a new aftermarket pump motor. But that is just me.

 

[flyingscott]

How to test a dc motor is on youtube.

 

[boscoe99]

Yes. There are only two leads coming from the motor. So am I correct in my assumption that the relay switches the +/- polarity to make the trim motor spin in either direction?

Yes.




cross wallpaper 4k

 

[boscoe99]

View attachment 355174
How to test a dc motor is on youtube.

I am failing to see the connection between verifying that a part cannot perform its function and replacing said part, with "throwing parts at a problem".

 

[flyingscott]

I am failing to see the connection between verifying that a part cannot perform its function and replacing said part, with "throwing parts at a problem".

How do you know it is not a simple fix? But I guess it is easier to tell someone to replace it when it is not your money. Those are not cheap motors and the ones that are won't be worth installing.

 

[99yam40]

How do you know it is not a simple fix? But I guess it is easier to tell someone to replace it when it is not your money. Those are not cheap motors and the ones that are won't be worth installing.

this from someone that has no idea how many relays his motor has for the T&T.
Just give it a rest, you are not helping the OP or anyone else

 

[boscoe99]

How do you know it is not a simple fix? But I guess it is easier to tell someone to replace it when it is not your money. Those are not cheap motors and the ones that are won't be worth installing.

I am not trying to tell anyone to do anything. I was only trying to help the OP determine where the core problem resided. Trying to separate the trim tilt pump motor from the trim tilt relay from the trim tilt switches from possibly a power supply issue.

Where he goes from there is up to him.

Now if he wants to dive into trouble shooting the pump motor we can help him do that as well.

 

[boscoe99]

this from someone that has no idea how many relays his motor has for the T&T.
Just give it a rest, you are not helping the OP or anyone else

He seems to have forgotten the first rule of holes. When you find yourself in one, stop digging.

 

[boscoe99]

this from someone that has no idea how many relays his motor has for the T&T.
Just give it a rest, you are not helping the OP or anyone else

Well in all fairness, the F90 has only used a relay assembly (two integrated into one unit) since 2005.

 

[flyingscott]

this from someone that has no idea how many relays his motor has for the T&T.
Just give it a rest, you are not helping the OP or anyone else

You are just mad because I disagreed with your approach of throwing parts at it. Wiring diagram shows 2 relays so am I really that wrong?

 

[flyingscott]

He seems to have forgotten the first rule of holes. When you find yourself in one, stop digging.

This coming from a parts replacer?

 

[flyingscott]

Hey if you two want to be parts replacers that's fine. But don't get snippy at me because I prefer to diagnose things. What's wrong with testing the motor? What if the pump is the problem? How do you know it doesn't have a broken wire? Could be a $2 part. So you just told the Op to buy a motor , what if it's not the motor? Like I said it is easy to load the parts canon when it's not your money Just because you two aren't capable of doing a proper diagnostic doesn't mean we all are!!!. To the OP sorry about this. If you have any more problems. I am sure Boscoe or 99yam will be more than happy to tell you what parts to replace. Me personally I would buy a service manual and follow the tests but that is just me.

 

[boscoe99]

You are just mad because I disagreed with your approach of throwing parts at it. Wiring diagram shows 2 relays so am I really that wrong?

Not mad at all. Just perplexed.

You must be looking at the wrong wiring diagram.

Not really wrong. Just wrong. No shame in that. Any shame comes about from failing to accept the truth.

 

[boscoe99]

This coming from a parts replacer?

Yep. A parts replacer.

Replacing parts. Individual piece parts if the customer wants. Or component parts if the customer wants.

Piece parts can be cheaper but then the labor will be higher. Higher labor can result in a total repair cost greater than just replacing the component part.

A repaired part may not be as reliable going forward given that other piece parts within may be nearing the end of their life.

Component part replacement should provide a greater life than a component part repaired with piece parts. Repair should be faster.

It is all a trade off. What the customer wants the customer should get.

 

[boscoe99]

Hey if you two want to be parts replacers that's fine. But don't get snippy at me because I prefer to diagnose things. What's wrong with testing the motor? What if the pump is the problem? How do you know it doesn't have a broken wire? Could be a $2 part. So you just told the Op to buy a motor , what if it's not the motor? Like I said it is easy to load the parts canon when it's not your money Just because you two aren't capable of doing a proper diagnostic doesn't mean we all are!!!. To the OP sorry about this. If you have any more problems. I am sure Boscoe or 99yam will be more than happy to tell you what parts to replace. Me personally I would buy a service manual and follow the tests but that is just me.

The service manual that indicates there are are two trim and tilt relays?

 

[flyingscott]

Hey Boscoe when you learn how to read a wiring diagram let me know. It clearly shows 2 relays in the wiring diagram YOU put up. Just because they are in a box and you can't see them doesn't mean there is only one. There is one box containing 2 relays. Post #31 you clearly state 2 relays in one unit. Are you lying? I am out, I am not going to teach you how to read a wiring diagram. Its a simple dc wiring circuit nothing special about it.

 

[boscoe99]

Hey Boscoe when you learn how to read a wiring diagram let me know! It clearly shows 2 relays in the wiring diagram YOU put up. Post #31 you clearly state 2 relays in one unit. Are you lying? I am out I am not going to teach you how to read a wiring diagram.

The section of the wiring diagram I posted shows one relay assembly.

The parts breakdown illustration I posted shows one relay and two relay assemblies.

One trim/tilt relay assembly.
One starter motor relay.
One main and fuel pump relay assembly.

I shall refrain from asking for your help in reading a wiring diagram. Thanks for your help.

 

[boscoe99]

The testosterone certainly be flowing today.