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

The alternator has only two wires attached, 8ga. brown and a smaller
green wire going to the regulator that was mounted higher on the
front of the engine near the water temp housing. Before the end of
boating season I took both into a alternator shop and had them tested
and they both came out good.

I have two batteries in the boat, one I added myself for backup. I
also mounted a simple A/B/AB Battery switch to the engine cover.

On May 4, 2009, at 2:44 PM, Lee Shuster wrote:

> Jeff,
>
> I had forgotten that the Horn was standard on the 17's even having
> the switch as part of the dashboard.
>
> But if someone replaced the (marine-rated) Prestolite alternator
> and it's external regulator, I guess you should determine what the
> replacement alternator is and it's condition? If it's a Delco
> (with internal regulator) is it a one-wire or three-wire? My guess
> is, this has a higher probability of being the root cause of your
> failure to charge your batteries.
>
> You mentioned battery-plural. Is there a dual battery setup? If
> so, what method of switching or isolation is in place? That also
> could be a problem.
>
> I only raise these "other" questions because ammeters rarely fail.
>
> Lee
>
> From: omc-boats-bounces@... [mailto:omc-boats-
> bounces@...] On Behalf Of Jeff LaCoste
> Sent: Monday, May 04, 2009 3:00 PM
> To: Evinrude & Johnson Boats of the 1960's and 70's
> Subject: 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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>>
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Received on Monday, 4 May 2009