power trim question

[99_sierra]

ok here goes it i got a 1982 mercury 75 hp with power trim my question is will it work on a 1970's mercury 85 hp i think it will bolt up ok it's just thats one wire goin to my switch box on the 82 and on the 70's motor don't have a switch box so where would i hook that wire up is it a power wire or a ground and if i'm correct by just looking at the wire's goin to the trim it just gets the power from the main silonoid can someone plz help me out

 

[Chris1956]

Re: power trim question

If the PTT unit is the two trim cylinder w/ four hoses, it should work on the Merc 850. BTW- Merc does not show a 75HP motor was made in 1982. As for the switchbox, if the '82 motor has 4 coils, and the 70s 850 has a distributor, it will not work. If they both have four coils, it might work.

Power to the PTT unit is via seperate cables to the battery.

 

[99_sierra]

Re: power trim question

ok well the marina told me it was a canadian 75 hp maybe they are wrong...lol...anyways the 75 has 4 coils where the 850 has a dist. iwas goin to chance the whole mouting bracket the only thing i see thow is 2 siliniods and one power wire running to the starter siliniode that feeds power to the trim unit and one wire running to the switch box is this power wire or a ground or constance power for the trim unit because it did work without the key on before