Trim Pump will not work /INOP

[armstrongd]

My trim pump will not make any sound at all. I push all the buttons and I get nothing at all. It could be the wiring or I think it may be the silenoid. ANy tests to try.Could someone help me or possibly send a picture of the wiring so I will be able to compare.

It is an 120 Hp Mercruiser 1971.

 

[jtybt]

Re: Trim Pump will not work /INOP

Find the wiring harness.( red/green/blue) Jump the red to the blue or green to test the motor.

 

[armstrongd]

Re: Trim Pump will not work /INOP

Thanks, sorry took so long to reply. I'm new to this site. I will try it tommorrow. Do I need to have the ignition on while I do this?

 

[Bondo]

Re: Trim Pump will not work /INOP

Do I need to have the ignition on while I do this?

Nope,... The Trim system should be wired directly to the battery....

There's Manuals available up in the Adults Only section of this forum,...
Help yourself....

 

[armstrongd]

Re: Trim Pump will not work /INOP

Ok gents, I have sound at at least. I purchased a new solenoid and looked at another boats wiring to see how mine should be. I have a start . Something is now making a running sound like small gears moving but I see nithing happening with the trim. As far as wires heres what I have according to my small knowledge of schematics.

On solenoid.
Large Bolt on Left side- wire from starter positive and red wire from back of harness plug.
Large Bolt on right- Blue wire from pump motor.

Small screw Front Left- Purple wire from 4 wire trim harness

Small Screw front Right- Black wire from pump motor and negative wire to battery.

My next question is where does the blue wire from the trim harness go. I have the purple wire on the left front screw,I only have action when i push the up/out button on the switch. Nothing from the bottom IN button or the top UP button.

I also have 2 blue wires coming from the back wall I don't know where they go either. They have open ends as if the go to the solenoid somehow.

 

[Bt Doctur]

Re: Trim Pump will not work /INOP

We really need to know what system you are working on , Merc,OMC,Volvo, etc.Wiring manuals available in the adults section.

 

[armstrongd]

Re: Trim Pump will not work /INOP

.........

It is an 120 Hp Mercruiser 1971.

Here it is from the original post.

 

[armstrongd]

Re: Trim Pump will not work /INOP

Find the wiring harness.( red/green/blue) Jump the red to the blue or green to test the motor.

Here is the current wired layout,I only have action from the middle button. Hope this helps.

 

[armstrongd]

Re: Trim Pump will not work /INOP

View attachment 39352
Hello guys I have found an excellent diagram from one of the other members. I have color coded before I attempt to wire my pump as such I have a question.
On the diagram it shows a trim limit switch in the middle of the harness wiring. On my wiring it goes from from to back with no breaks. Do all boats have this Trim Limit Switch and if so where do I look? My purple and blue wires come out the harness right behind the plug.


P.S. Could that possibly be the 2 blue wires coming from the back wall?

 

[Bt Doctur]

Re: Trim Pump will not work /INOP

More valuable information is available in the "Adults Section"
Here is the link for trim/tilt
http://www.boatfix.com/merc/Techbk/97/97hs6.pdf

 

[armstrongd]

Re: Trim Pump will not work /INOP

More valuable information is available in the "Adults Section"
Here is the link for trim/tilt
http://www.boatfix.com/merc/Techbk/97/97hs6.pdf

That seemd to be for the newer power trims. I guess mine is the older type with 1 solenoid.

 

[Bt Doctur]

Re: Trim Pump will not work /INOP

Sorry, must have missed that. Anyhow, the solenoid controls the "up " motion.
Check both the main power connections especially the grounds. The solenoid needs a ground to operate. The down circuit is connected to the plastic mounting tab just to the right of the pump. There is no relay because merc felt it takes less currect to go down.The 3 wire harness needs to have power on the red lead to the switches for the trim to work.Either manual 1 0r 2 will have this infornation ,it`s in the adults section.

 

[armstrongd]

Re: Trim Pump will not work /INOP

I have purchased a used trim pump from a guy that had a 115 Hp outboard. The pump looks the same but I wanted to know if it would work on this boat in case this one turns out bad. The first thing I notice is that it only has 2 wires coming from the Hydraulic motor.

WILL THIS PUMP WORK WITH A 120 INBOARD MOTOR>

 

[Bondo]

Re: Trim Pump will not work /INOP

Ayuh,... It might work, but Outboard pumps Are different...