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ContinuousWave: Small Boat Electrical
OMC Ignition switch
|Author||Topic: OMC Ignition switch|
posted 08-17-2008 01:07 PM ET (US)
I have an older OMC Evinrude 48-HP outbord motor. The ignition switch would not shut off the motor. So I bought a new ignition switch. The old ignition switch has the poles A-B-C-S-M-M the new one has I-B-C-S-M-M. I switched out the A with the I and it does not work. It was working yesterday with the old switch just fine. [Solicits diagnostic advice.] [Solicits] a place that sells a switch identical to the old one. Thanks
posted 08-17-2008 02:11 PM ET (US)
The [problem] may not be your switch, it may be in your engine harness. Outboards are typically shut down by applying a ground to the coils. I just recently fixed a Mercury-powered Tracker. There were two ground leads coming off the ignition switch. When I [checked the resistance] of the engine harness plug at the engine end, there was only 1-ohm. I hooked a temporary lead from [the negative terminal] at the battery, started the motor up, touched the lead to the coil ground post, and she shut right down. Somewhere in the engine harness, that shutdown circuit got interrupted. Changed out the harness, all was well.
posted 08-17-2008 07:26 PM ET (US)
Thanks. I'll give that a try.
posted 08-18-2008 09:00 AM ET (US)
For information about ignition switch wiring see
The KILL circuit operates at a rather high voltage. If the insulation on the KILL circuit conductor is damaged, you could have a short to ground on that circuit when voltage is present.
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