Re: [OMC-Boats] 1964 OMC Johnson Deluxe - Wiring Diagram?

>> 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

J

On May 4, 2009, at 10:59 AM, Lee Shuster wrote:

Here's a couple of resources:

I made a web-html-spreadsheet that shows the wiring colors on my 66 150 hp Sterndrive.
You don't need Excel software to view it. It should be very similar to you 64.
You will see tabs at the bottom that group wiring functions by physical location. Scroll down to view instructions.
You can also click on the where the blue hyperlink to view "distant" end of the wire connects to. See:
http://hhscott.com/evinrude/docs/electric_all_66.htm

Also, if you are a more visual learner you may view the BLACK & WHITE factory (1968) schematic here:
http://hhscott.com/evinrude/images/wiring/68_v6_ALL_WIRE.jpg (Click to ZOOM in)

A later (1973) full-color sterndrive schematic is here, but it was for generic OMC OEM boat builders, not the E_J_O boats as above.
http://hhscott.com/evinrude/images/wiring/73_OMC_V8_all_big.jpg

What is the symptom that makes you think the ammeter is bad?

The factory used in-series, full-current flow Ammeters. By that, I mean there were no parallel current shunts that proportionately divided the current flow. An ammeter isn't likely to fail, but after 40 yrs, I'd first start be inspecting and cleaning all the wiring junctions and connections. You can easily bypass the meter by safely joining it's wires together. You could easily test the ammeter, by taking it out of it's circuit (remove the wires from it) and then testing it with a VOM or test lamp in circuit. If the ammeter won't pass current to light a small test bulb and it's needle doesn't deflect under load, then it probably is bad.

Lee Shuster

-----Original Message-----
From: omc-boats-bounces@...<mailto:omc-boats-bounces@...ltimate.com> [mailto:omc-boats-bounces@...] On Behalf Of Jeff LaCoste
Sent: Monday, May 04, 2009 10:59 AM
To: Evinrude & Johnson Boats of the 1960's and 70's
Subject: [OMC-Boats] 1964 OMC Johnson Deluxe - Wiring Diagram?

Does anyone know where to find a wiring diagram for the OMC 1964 Johnson Evinrude/Deluxe Sterndrives (150hp). I have looked at everything I can online and in the Seloc manuals but the wire colors don't seem to match.

Also, is it possible for a Amp meter to go bad? ...and is there a way to test for this??

Thanks much,
Jeff

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Received on Monday, 4 May 2009