Re: [OMC-Boats] Electrical Syetem 1970 Seasport

Your wiring will be color-coded very similar to the color diagram I have up on the site from a 1972-3 manual. You should have the "later" style, round, yellow and black connectors on the starboard side of the motor. For the color diagram was for OMC OEM boat builders and they typically installed their own fuel gauges.
 
ALso, it's not obvious on my web site but the diagrams scale larger depending on your broswer. If you're using MS IE a button will apper in the lower right-hand corner which will allow you to zoom into the diagram.
 
AS far as the malfunctioning fuel guage goes, it's most likely a faulty tank sender, or bad wire or ground. If I recall when I replaced mine a few years back, OMC used a standard Stewart-Warner 240-30 ohm sender. I can't remember but I think the higher resistance is empty, the lower full. 100-ohms sounds "about" right for 7-gal (roughly have a 16 gal tank). I manual will explain all this if I got it wrong from memory. Here's an explanation:
http://auto.howstuffworks.com/fuel-gauge1.htm Take a ohmmeter reading at the sender between ground and the sensor terminal. Drain or siphon out a couple gallons and re-measure. The reading should increase in ohms as the tank fuel level decreases. I think your (1970?) boat has the fuel tank buried in the floor, so I'm not sure how eas it will be getting to it?
 
The combined Fuel-Amp gauge can be kinda confusing. Basically there are three pairs of wires:
 
The heavy gauge wires are for the ammeter only.
The fuel gauge has a pair of wires, one wire routes to the sender, the other a 12 v source.
There is a wire for dash illumination and a return ground wire on the case for the illumination circuit
 
Pretty simple if you break it down, as shown on the b/w 1968 diagram on my website.
 
lee
 
 

________________________________

From: omc-boats-bounces@... on behalf of Ted Robinson
Sent: Sun 12/21/2008 1:59 PM
To: omc-boats@...
Subject: Re: [OMC-Boats] Electrical Syetem 1970 Seasport

Lee,
Thanks so much for the info and the direction to the wiring site.
It appears that I have wiring that falls between the 1968 and 1973
schematics. If I was an electrician I could probably figure it out better,
but I have to struggle to trace and try to figure out what this here little
ole wire does. I replaced all the wires between the starter and assist relay
one at a time because of corrosion and missing insulation. My combination
amp/fuel gauge appears to be inop, so that is why I am trying to trace
wires. The gas gauge reads empty with 7 gals of gas installed. The sender
reads over 100 ohms with the pink wire disconnected ,but I am unsure what
ohms I should be to looking for, or what I should be reading in the pink
wire from sender to gauge.
I have both red and orange heavy gauge wire at the fuel/amp gauge as well as
ground and the pink wire.
I have not removed any wires from the gauge assembly, I am reluctant to
disassemble until I understand it better.

Thanks again for your help
Ted Robinson
Terrebonne, Oregon
----- Original Message -----
From: <omc-boats-request@...>
To: <omc-boats@...>
Sent: Friday, December 19, 2008 4:50 AM
Subject: OMC-Boats Digest, Vol 20, Issue 1

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> Today's Topics:
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> 1. Electrical system on 1970 16' Saesport 155 (Ted Robinson)
> 2. Re: Electrical system on 1970 16' Saesport 155 (lib1@...)
> 3. 1964 Evinrude (Paul.Devin@...)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 18 Dec 2008 09:41:42 -0800
> From: "Ted Robinson" <tederobinson@...>
> Subject: [OMC-Boats] Electrical system on 1970 16' Saesport 155
> To: <omc-boats@...>
> Message-ID: <E7578A69DADE4A35BC2E3BCD4A3288FD@...>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I would like to find a manual that describes the electrical system on my
> particular boat.
> Which alternator did they use on my boat, internal regulator or external
> regulator?
> Prior owner replaced mechanical fuel pump with electric, I would like to
> go back to mechanical,but where to find one?
> My engine is the HUFR-19E model. SELOC indicates its a Kiser and I assume
> it is a GM built for kiser?
> Thanks
> Ted Robinson
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> Message: 2
> Date: Thu, 18 Dec 2008 22:36:27 -0700
> From: <lib1@...>
> Subject: Re: [OMC-Boats] Electrical system on 1970 16' Saesport 155
> To: "Evinrude & Johnson Boats of the 1960's and 70's"
> <omc-boats@...>
> Message-ID: <114F4A31601047B1819613D6FECFC6D6@...>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi Ted,
>
> As far as "shop" manuals for 1970 OMC Stern drives (aka electric-shift
> stringer models); there are the original factory written ones (hard to
> find but you do see them come up on eBay from time to time), The SELOC
> manual and there's another one I think by Clymer.
>
> The original factory manuals are worth paying extra for IMHO. Be sure and
> scope in years from 1968 to 1972 if you care about covering the
> Buick/Kaiser 225 CID/3.7L (odd-fire) V6.
>
> You can view some free electrical diagrams that I have scanned and posted
> here:
> http://hhscott.com/evinrude/wiring.htm
>
> If your boat still has the original Alternator-Regulator it is a
> MARINE-APPROVED Prestolite ALK-series 38-40 amp unit with external
> solid-state regulator normall mounted on the thermostat housing (for good
> heat disapation). These are decent alternators, and can provide good
> service, with little more than brush replacement and proper battery care.
> A good local shop should be able to rebuild the Prestolite for you. Some
> marine shops turm their noses up as the Delcos are now much more common,
> incorporating the internal regulator.
>
> You can locate a Carter Marine-rated mechanical fuel pump, to go with the
> Buick-Jeep V6. Just be sure if it has the relief vent that you route it
> back into the carb, rather than having it dump raw fuel into your bilge
> (FIRE hazard!). Most of the marine suppliers that have OMC parts would
> have a suitable mechanical pump. (Please be tempted to substitute a
> non-marine rated unit.)
>
> GM sold the tooling to Kaiser Jeep for the 225 in 1966-67. When AMC
> acquired Jeep from Kaiser in 1972, they brought in their AMC inline 6,
> such as the 232. Ironically, GM-Buick bought the V6 tooling back in 1974
> after OPEC stuck it too us. When OMC lost the Buick V6 they switched to
> using the inline Chevy 250-6. Eventually they went back to V6's in the
> late 70's but the were the 90-degree Chevy V6's which are 3/4's of a
> smallblock V8. I have quite a bit of info on the nifty little odd-fire
> 225 V6 at: http://hhscott.com/evinrude/buick_v6.htm
>
> Happy Holidays to all,
>
> Lee Shuster
> Salt Lake City
>
> ----- Original Message -----
> From: Ted Robinson
> To: omc-boats@...
> Sent: Thursday, December 18, 2008 10:41 AM
> Subject: [OMC-Boats] Electrical system on 1970 16' Saesport 155
>
>
> I would like to find a manual that describes the electrical system on my
> particular boat.
> Which alternator did they use on my boat, internal regulator or external
> regulator?
> Prior owner replaced mechanical fuel pump with electric, I would like to
> go back to mechanical,but where to find one?
> My engine is the HUFR-19E model. SELOC indicates its a Kiser and I assume
> it is a GM built for kiser?
> Thanks
> Ted Robinson
>
>
> ------------------------------------------------------------------------------
>
>
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> Message: 3
> Date: Fri, 19 Dec 2008 07:32:14 -0500
> From: Paul.Devin@...
> Subject: [OMC-Boats] 1964 Evinrude
> To: omc-boats@...
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>
> All:
>
> I'm looking for this type boat specifically (1964 Evinrude Gull Wing Hull,
> Outboard & Drop Down Windshield). Can anyone assist?
>
> Please advise
>
> paul.devin@...
>
> (See attached file: id_bs_14_small.jpg)
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