Go Back  Offshoreonly.com > Technical > General Q & A
Single trim switch on dual engines ??? >

Single trim switch on dual engines ???

Like Tree0Likes

Single trim switch on dual engines ???

Reply

Old 08-14-2002, 05:06 AM
  #1
aussie
Guest
 
Posts: n/a
Question 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.
 
Reply With Quote
Old 08-14-2002, 05:22 AM
  #2
Charter Member #232
Charter Member
 
Audiofn's Avatar
 
Join Date: Oct 2000
Location: Carlisle, MA USA
My Boat: 1979 Formula 302, 99 Formula 353, 81 Donzi 18 2+3 with 454
Posts: 18,389
Default

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

Jon
__________________
Put your best foot forward!
Audiofn is offline  
Reply With Quote
Old 08-14-2002, 06:04 AM
  #3
aussie
Guest
 
Posts: n/a
Default

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

Dave.
 
Reply With Quote
Old 08-14-2002, 07:16 AM
  #4
Registered
 
MikeScarab28XLT's Avatar
 
Join Date: Mar 2001
Location: GERMANY Aschaffenburg
My Boat: Wellcraft Scarab 28XLT twin 502EFI Bravo One 30" BB lab
Posts: 273
Default

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 !
MikeScarab28XLT is offline  
Reply With Quote
Old 08-14-2002, 07:21 AM
  #5
aussie
Guest
 
Posts: n/a
Default

Thanks Michael,
very helpful answer !!!!!!!!!!!!!
Cheers,
Dave.
 
Reply With Quote
Old 08-14-2002, 08:53 AM
  #6
Registered
 
Join Date: Oct 2000
Location: Knoxville,TN, USA
My Boat: 1986 Cigarette
Posts: 371
Default 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.
deboatmon is offline  
Reply With Quote
Old 08-16-2002, 09:45 AM
  #7
Platinum Member
Platinum Member
 
mcollinstn's Avatar
 
Join Date: Sep 2001
Location: tn
My Boat: 1991 F311SR1
Posts: 5,516
Default

please show wiring diagram
mcollinstn is offline  
Reply With Quote
Old 08-16-2002, 10:44 AM
  #8
Charter Member#157
Charter Member
 
MnFastBoat's Avatar
 
Join Date: Oct 2000
Location: Minneapolis, Mn, Usa
My Boat: 1999 Advantage 28' Cat
Posts: 1,851
Default

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
__________________
This Cat is trying to keep up with the Big Dogs
MnFastBoat is offline  
Reply With Quote
Old 08-16-2002, 12:16 PM
  #9
Registered
 
Join Date: Jan 2001
Location: ST. Louis, MO, USA
Posts: 1,658
Default

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
Gary Anderson is offline  
Reply With Quote
Old 08-17-2002, 05:35 AM
  #10
Registered
 
MikeScarab28XLT's Avatar
 
Join Date: Mar 2001
Location: GERMANY Aschaffenburg
My Boat: Wellcraft Scarab 28XLT twin 502EFI Bravo One 30" BB lab
Posts: 273
Default

http://www.rexmar.com/page42.html
MikeScarab28XLT is offline  
Reply With Quote

Quick Reply: Single trim switch on dual engines ???


OSO Sponsor
OSO Advertiser
OSO Advertiser
OSO Advertiser