Re: [OMC-Boats] Wiring Diagram

Jeff,
 
Lee's wiring diagrams were quite useful when I did some rewiring on my '70 Evinrude Explorer.  I had the same problem in that the colors didn't necessarily match up but if you've got a good sense of logic you can make do with those diagrams.  I traced the wires from the front to the back and though they might have been a different color, the diagram matched nearly exactly (well, for mine anyway).
 
Thanks Lee, for having those handy resources!
 
-Bill
Dallas, TX
1970 Evinrude Explorer - 155 V6 OMC Sterndrive
http://www.photobucket.com/evinrude_explorer

--- On Mon, 5/4/09, omc-boats-request@... <omc-boats-request@...> wrote:

From: omc-boats-request@... <omc-boats-request@...e.com>
Subject: OMC-Boats Digest, Vol 25, Issue 8
To: omc-boats@...
Date: Monday, May 4, 2009, 3:20 PM

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Today's Topics:

   1. Re: 1964 OMC Johnson Deluxe - Wiring Diagram? (Lee Shuster)
   2. Re: 1964 OMC Johnson Deluxe - Wiring Diagram? (Jeff LaCoste)

>> 8ga. brown wire from Amp+ to Master Switch (is this wire run all the way to the Battery Power Switch?)  <<
 
 
As far as I know, OMC didn't add the MASTER (Disconnect) Switch which is located under the helm dash until 1967 models (my 66 Sportsman didn't have a disconnect switch).
 
This switch is "downstream" of the Ammeter and basically cuts off all 12+ vdc going to the fuse distribution panel, but the ammeter remains "hot" As far as I know, the factory never installed "Battery Power Switches" in the engine compartment. If you boat has one of those, I'd be checking out all the wiring. Does you boat have a working Prestolite Alternator and solid-state regulator?
 
The wiring on OMC boats seems a little complicated compared to other boats of the day, but they were well documented and the harnesses were originally well laid out. Getting good reliable, corrison-free connections will provide enhanced reliability and peace of mind. It's hard to get a jump start when your miles from the dock.
 
 
Also, to avoid confusion: On early OMC (62-67) models the GREEN, LARGE 8 GA wire connects the (-) Ammeter terminal to the (+) source. Some ammeters label their (-) BAT and their (+) GEN.
(You won't urt an ammeter by hooking it up with reversered polarity.) On later OMC (68-up) models this got confusing because the BROWN (replaced the GREEN (-) and ORANGE replaced the BROWN (+) on the ammeter.  My spreadsheet chart uses the OLDER 62-67 color scheme.
 
>>  8ga. brown wire from Amp+ to + Buss Post <<
 
I believe this is only necessary if you boat is equipped with a horn. It's basically just a accessory junction point for connecting additional unfused devices. I'm not sure if this (under helm-dash)junction point was installed on all boat models?
 
Lee Shuster

From: omc-boats-bounces@... [mailto:omc-boats-bounces@...ultimate.com] On Behalf Of Jeff LaCoste
Sent: Monday, May 04, 2009 1:03 PM
To: Evinrude & Johnson Boats of the 1960's and 70's
Subject: Re: [OMC-Boats] 1964 OMC Johnson Deluxe - Wiring Diagram?

All very helpful Lee, thanks for sharing.

I think my plan will be to use the schematics you posted as a visual reference, matching only the specific wire colors I can for now. 

This all started because my batteries were not keeping a charge. After looking more closely I noticed that the wiring loom on the engine had been spliced many times over the years and some wires went nowhere. I figured I would jump in and rework the loom and learn a little more about which wire goes where in the process.

As for the amp meter, I had it tied together on a unused post on the circuit board but I would like to get it working again to check on the batteries. At this time I only have the 8ga. green and brown wires coming in the dashboard. Your schematic also shows three 10ga. brown wires, I guess I am missing a few connector wires there.

I plan on adding these to the Amp meter...
8ga. brown wire from Amp+ to + Buss Post

8ga. brown wire from Amp+ to Master Switch (is this wire run all the way to the Battery Power Switch?)

8ga. brown wire from Amp+ to "B" Ignition switch

 
Received on Monday, 4 May 2009