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

For what its worth I have had two 1964' Johnson Deluxes and neither
have had this Master switch. The Alternator I believe is a solid
state added in the last couple years. The fuse panel is located up
underneath the dash where the Green and Brown 8ga. wires connect.
There is a horn on these models and a fuse for it on the Buss.

Soon I'll get the wire loom put back together along with the ammeter
and see what I have. Thanks again for the help.

J

On May 4, 2009, at 1:17 PM, Lee Shuster wrote:

> >> 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@...] 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@...] 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