Mercury 850 & tilt trim motor

[cpad1975]

I appologize for sounding like a dummy, but I am needing some help. I just bought an old Thundercraft with a 1975 Mercury 850 Thunderbolt. I want to rewire the entire boat, and understand the basics for guages etc, but the tilt/trim motor just clicks going up and does nothing going down. I want to rewire all of this also, but need some help. A wiring diagram would help. I'm not familiar with the tilt/trim motor wiring either. It seems to be a motor with a solenoid attached to the side of it. Two wires have been spliced from the spaghetti wiring and are sent to the hydraulic arms. This is also a big mystery to me because there are no electronics near the arms. Maybe 2 groung wires? If anyone can help I would greatly appreciate it.<br />cpad33@comcast.net

 

[KeltonKrew]

Re: Mercury 850 & tilt trim motor

My tilt/trim motor will do the same thing on my Merc 35 (same mechanism). I tap it with a hammer and it will work. Sounds like you need to replace the solenoid.<br /><br />I'm getting ready to add the cmc PT-130 which has a 6" setback and tilt/trim and get rid of the heavy pump/motor and expensive parts for the tilt/trim. I had to replace 1 hose.....EXPENSIVE!!!!!!<br /><br />Check into the PT-130....I think you'll find a better route than going back with the heavy Merc stuff.

 

[rickdb1boat]

Re: Mercury 850 & tilt trim motor

Ditto on KeltonKrew suggestion. Get rid of that bulky T+T and go with the CMC. For the money you would spend anyway to repair the old one or find a new unit, you will wind up ahead.<br /><br /> web page

 

[cpad1975]

Re: Mercury 850 & tilt trim motor

Thanks for the tip guys, buy I've drained my funds for now. That will definitely be my next purchase. Does anyone have any of the diagrams I was looking for?

 

[Ken G]

Re: Mercury 850 & tilt trim motor

Wiring diagrams are in Seloc Manuals sold at iboats and some marine dealers. Some public libraries have the manuals also.

 

[cpad1975]

Re: Mercury 850 & tilt trim motor

Thanks guys, but I got gutsy today and decided to take the whole thing apart. It turned out to be the springs that push the brushes out were a little corroded. The brushes weren't making good contact. I cleaned and lubed her up a little, and she's working better than ever. Hopefully I'll get a couple more years out of her before I get that new one you mentioned. Thanks again!