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Author Topic:   OMC Outboard Gauges
motorhenry posted 06-16-2011 02:40 PM ET (US)   Profile for motorhenry   Send Email to motorhenry  
I bought a used 1997 GS160 [G]lasstron that was sitting around outside for about three years with no cover on it and no motor on it. [T]he motor that was on it was a 1997 [J]ohnson. I picked up a used 115 [J]ohnson [Ocean Runner]. All the plugs [i.e., the electrical connectors in the wiring harness, not the spark plugs] that were left on the boat from the other [J]ohnson fit just nicely [to the new Johnson outboard engine].

When I turn the key to start I get no [S]ystem [C]heck lights that work and no [aural alarm sounds]. And when the motor starts the [engine tachometer] with the [S]ystem [C]heck lights that are in it also will not work. I also found that the [bus] was removed. I think it has a bad gauge can. [S]ome one please help me on this. Thanks. motorhenry

jimh posted 06-16-2011 04:24 PM ET (US)     Profile for jimh  Send Email to jimh     
I recommend you get the rigging manual or the service manual for your OMC engine. Get the factory literature, not some after-market boiler plate book. The OMC literature will have details of all the wiring associated with the OMC System Check gauge.
jimh posted 06-16-2011 04:32 PM ET (US)     Profile for jimh  Send Email to jimh     
It is hard--almost impossible--to describe details of electrical wiring circuits in a narrative form, and a schematic diagram is much better at conveying information. You will find that in OMC literature they use a combination of a schematic diagram and a pictorial diagram of the electrical wiring, and that the accompanying text is written in a manner which assumes that the reader does not have a great deal of background in electricity or electrical circuits. In this way the OMC literature is easily understood by almost any reader without regard to his background in electricity and electronics. This makes the original OMC Johnson and Evinrude service and rigging literature a good resource for solving electrical problems with your older OMC outboard engine.
jimh posted 06-16-2011 04:37 PM ET (US)     Profile for jimh  Send Email to jimh     
There is no telling why some electrical or electronic component on your boat does not work. The cause could be any number of things:

--you don't have power to the device
--the device is defective
--the circuit that feeds the signal to the device that the device is supposed to display is defective.

The basic approach to electrical problem diagnosis is to first gain a thorough understanding of the circuit. Then, assess the symptoms that the circuit gives with regard to how the circuit is supposed to work. Then look for elements in the circuit, which if they fail would cause the symptoms.

In the case of an OMC System Check Tachometer failing to make an aural alert, display a sequence of annuciator lamps at initial start-up, and fail to have the tachometer work, my best estimate is that:

--you have no power to the device, or

--the device is defective.

motorhenry posted 06-18-2011 08:17 PM ET (US)     Profile for motorhenry  Send Email to motorhenry     
Thanks for the info.I installed a new gauge and all is well on that side.

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