Ignition off switch does not work

[rwinn]

New to the forum and just purchased my boat but needing some help. I recently purchased a pontoon with a 1994 90 hp Mercury. I noticed that when I went to shut off the motor it would not! I have to pull the kill switch to do this. I purchased a new ignition switch but it didn't help. Also, I noticed that I get no self test on the oil injected warning alarm. Could the previous owner had bypassed the warning alarm by rerouting some electrical?

 

[Texasmark]

The Black wire with yellow stripe is the ignition kill wire. When the ignition switch is in the off position it grounds this wire which kills your CDI ignition modules. You could have several problems and the easiest thing to do is to go to the connector in the engine where the remote cable hooks up, pull the connector apart and looking at the remote cable half, find the pin with that wire. With the ignition switch in the OFF position ohm between that pin and a non painted (electrical ground, battery - whatever you want to call it). If functioning properly you will get about 1 ohm. If you don't and you have replaced the switch, you have an open wire, either the ground to the control box or the black wire is open somewhere along the way.

If that doesn't solve the problem come back for more.

 

[rwinn]

Thanks Texasmark,

I'll try that this afternoon. If there is an open ground somewhere would that also indicate why my oil injection warning

 

[rwinn]

Sorry, new to this. I'll try that this afternoon. If there is an open ground somewhere would that also indicate why my oil injection warning is not sounding?

 

[Texasmark]

I meant to correct an error this morning when I thought of it but got busy and forgot. With the plug removed, ohming to the batt - or engine block is a waste of time in pursuit of the problem. Take the connector mentioned, the one on the cable harness side and find the black with yellow stripe and black. If I still had my manual I could tell you which pins, but you can find them easy enough.

Putting the ignition switch in OFF should give you continuity and moving it to any other position should not. If you don't get the continuity mentioned and since you replaced the switch, find your broken wire.