Single trim switch on dual engines ???
 

Hi all,
Got a tricky question,
twin 496ho's that need to be kept electrically separate,
trying to fit a cp billet trim switch onto the throttles but need to;
a. keep the motors electrically separate
b. still be able to adjust drives separately if needed.
Sorta worked out how to do it with heaps of diodes & relays, just wondering how everyone else does it ??
Has anyone found a dual gang trim swith (throttle mount) for example ?
I live in a pretty remote part of the world as far as performance boats go.

cheers,
Dave.

I just used two diods and that was it when I did mine

Jon

Thanks Jon,
did you use a common power feed from 1 battery bank to work both ??

Dave.

you can buy it from Mercruiser, its named Dioden Kit for Dual Engines.

You need one for up and one for down !
one 812497A3 green and
one 812497A4 blue

848926A2 Switch
848922 Switchholder
848923 Switchholderbackplate
845587 screws

Thats only if you dont find a nother dioden solution !

Thanks Michael,
very helpful answer !!!!!!!!!!!!!
Cheers,
Dave.:) :) :) :)

single switch dual engines
 

Use diodes with at least 5-10 amps current capacity and at least 200 PIV. Use quality diodes and you will probably never have to worry about them. Although you will be running only 12 volts or so through them, the higher PIV ( peak inverse volts ) provides a more durable isolation junction. The higher current ratings also provide larger wire to solder to. Insulate well with heat shrink and silicon and forget them.

please show wiring diagram

Why not just go with a dual switch to control each drive seperatly at your finger tips :)
I have ordered one but have not made the time to install
I am always reaching down to adjust one side or the other just a bump or two.
This will allow indipentant response at instant reaction

I ordered mine out of Rex marine along with a single switch mounted to hte sterring wheel for my center trim tab :)

http://www.rexmar.com/page40.html

Diodes, they do everything with diodes these days.
4 diodes and a spdt momentary center off switch, single power source.
Or a dpdt momentary center off switch, with 2 power sources. Just make sure there is a separate power source for each of the individual trim switchs.
Not sure how to post a schematic though.
Gary

Thanks for all your help guys,
got it sorted with a couple of diodes & added relays to reduce the power thru the switch, works great !!!
I live in Perth, Australia & theres very little here in the way of performance boats so the project was a challenge, got some photos & vids on the site below,

cheers,
Dave.

www.wankboat.com

Wow!!! Very cool boat and video. Not many people can say they built there own boat.:cool: Looks like your havin' fun now.:D :D :D

Thanks MACDAD,
I'm having heaps of fun in the new boat, couldnt resist goin' the retro "Miami Vice" radar arch either.
I think I need a new project though,
it was good challenge !!!

Cheers,
Dave:D :D :D :D :D :D