Tilt trim wiring is shot

Chaos99

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Joined
May 13, 2017
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4
I've enjoyed this site in the past whenever a boating issue is beyond my knowledge.
This problem will probably be straightforward for you guys. I searched for this answer off and on now for a couple days.

Specs;
79 mercury 115hp
1980 bayliner 18'

Picked up the package in a trade, couple minor issues, nothing too major so far.

Has tilt and trim all set up for the most part, however the wires entering the motor are rotted out with only 4 inches exposed. No insulation to be seen, 2 wires are metal, one seems to be fiber of some kind.

Can someone give me some tips, on rewiring this so i don't throw out my back when i make it to the lake?

I haven't tried to activate the pump directly, the controls on the throttle are ineffective obviously.

Tilt has 2 hydro cylinders, and the pump has the big red plug I've read about with a blue and green wire.

Would this be an opportune time to install relays into this system?

It appears that I'll have to unhook the trim from the motor and the boat to access and rewire the trim sensor? If so ill be looking for a big tree to hook my chain hoist to.

I tried to post a pick (and this post) yesterday, but with my internet being as lousy as it is i had trouble getting it resized. Ill update when i get to some Wi-Fi.

Thank you so much for taking the time to read this, hopefully someone can help a fellow mariner out
 
Joined
Mar 23, 2010
Messages
14
Need to get your model # off of the engine to determine if you have a 2 or 3 wire trim motor. There is a pressure relief on the side of the trim unit that you can loosen to relieve the pressure in the trims system. It uses a large flat head screwdriver. loosen the pressure relief and using floor jack or large tree and come a long raise the engine up and engage the trailering lock. this will hold the engine up so you can replace the trim motor. Again, it should be a 2 wire motor. (green & blue wires. The wires feed up into the engine and hook up to the blue & green connectors in the wiring harness. The screws can be a bit of a pain but hopefully you'll be able to remove them with a long1/4 drive allen wrench or socket. It's pretty straight forward from there. Be careful removing the screws and don't break them or you'll have to remove the engine from the transom then. Good luck.
 

Chaos99

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Joined
May 13, 2017
Messages
4
Thanks for the info Rodney. The engine is a 79 serial number 5315344.

I can manually lift the engine into the trailer position. I'll attempt to dig into this a bit today and update this thread
 

Alumarine

Captain
Joined
Feb 22, 2005
Messages
3,756
Is the hydraulic pump in the boat and do the hydraulic lines go from it to the cylinders?
 

Chaos99

Recruit
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May 13, 2017
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4
Yes, the hydraulic system is hooked up. Again, sorry for not posting pics, they would tell the story a lot better then me.
 

Alumarine

Captain
Joined
Feb 22, 2005
Messages
3,756
Sorry, I wasn't clear.
There are 2 types of systems.
One has the hydraulic pump mounted on the motor and the other has the pump remotely mounted inside the boat with hydraulic lines going to the trim cylinders.

Which type do you have?
 

Chaos99

Recruit
Joined
May 13, 2017
Messages
4
xbd4c6.jpg


2nimce8.jpg

Hope this picture works for the wiring going into the mounting bracket.

Sorry for misunderstanding. The hydro pump is remotely located under the stern seating
 

Alumarine

Captain
Joined
Feb 22, 2005
Messages
3,756
The wires "going to the motor" are I think just for the trim sensor and the gauge if it has one.

To test the system make sure the pump has oil. It has a fill screw and above that a vent screw.

You can unplug the red plug and put a jumper between where the red wire would go and the green wire to test the down function and then
the red wire and blue wire to check the up function.
 

appleo

Petty Officer 1st Class
Joined
Jul 19, 2012
Messages
388
Agreed. Your electric motor and hydraulic pump are under the splashwell

Two hydraulic lines run from the pump to each piston


Remember green grass down and blue sky up. E.g. Apply 12 volt to green for. Down. Apply 12 volt to blue for up
 
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