3.0L Mercruiser Shift Interrupt not working.

[alldodge]

Just to clarify - on the old ignition systems the shift interrupt goes to ground. On the wiring diagram that is posted, the shift interrupt goes to +12v - NOT ground. Adding power to the line going to the distributor should cause it to die - not adding a ground.

Suggest having another look

 

[Fishermark]

Suggest having another look

Not sure what to say. One side of the shift interrupt goes to the distributor - the other side goes to purple wire - 12v positive.

 

[alldodge]

Not sure what to say. One side of the shift interrupt goes to the distributor - the other side goes to purple wire - 12v positive.

Dang you are right, my bad again :facepalm:
Just getting to tied up with the issue and can't see the forrest for the trees

Topvader1 my mistake, need to apply 12V to it

 

[Fishermark]

No problem - it happens! The only reason I know is because I recently changed my 3 liter over from points system to the newer Delco Voyager EST system. The instructions that came with the unit make it easier to see:

 

[Topvader1]

Sorry I am just seeing these now - for some reason I am not getting emailed notifications when someone posts on this thread.

The last part I am waiting for should be here tomorrow. So what you are suggesting is that I should put my jumper wire on the positive side of the battery and touch it to the pin on the module? Correct? If that stalls the motor then I know it was just that plug that was bad and I can return the new module and other parts that I purchased.

If I do need to install the new module, there were some white grease that came with it, where do I apply that? To the back to pins on the module that plug into the distributor?

 

[Topvader1]

One other question - I need to also test the purple wire that the interrupt switch plugs into. Since I was thinking that was a ground wire i was testing 12v on it to the positive side of the battery. Since it actually should read 12v all the time, I should test that purple wire to a ground point with a test light; and it should light up if good right?

 

[alldodge]

I'm not getting email notification either, only seeing on messages when logged in. Hope the folks will fix it soon

Yes need to apply 12V not a ground. If it kills the motor then its the plug not the module. The grease is used on the pins so when it's plugged in the grease keeps moisture out of the contacts.

The purple wire should show 12V when the key is turned to ON. The purple wire supplies power to the motor for it to run.

 

[Topvader1]

And to test that purple wire - I would put a test light between where the shift interrupt switch plugs into it and a good ground; right?

Grease is applied to the front pins that the wiring harness plugs into? Or the back where the module plugs into the distributor?

 

[alldodge]

And to test that purple wire - I would put a test light between where the shift interrupt switch plugs into it and a good ground; right?

This will work but a voltmeter is better. Test light will show there is power, but will not show if it is a full 12V

Grease is applied to the front pins that the wiring harness plugs into

Yes

 

[Topvader1]

Sorry for all the questions. But when I test it on a voltmeter, I want to touch the purple wire to the negative side of the battery right? I had already tested from positive to purple and it showed 12.8.

 

[alldodge]

Should be red meter lead to purple wire, and black meter lead to the negative battery or ground

Wires in the meter red is positive, and black is negative

 

[Topvader1]

I am happy to report that the shift interrupt switch is now operational! I switched my jumper wire to the positive side of the battery and touched it directly to the pin on the control module on the distributor (the original one, not the new one) and the motor stalled out!

I then installed the new wiring connector onto the module(Quicksilver Oem Part # 84-817374A01 Connector-Dist) and put a little dielectric grease on it, wired it to the white and green wire, started the motor and activated the shift interrupt switch and the motor again stalled.

I will be returning the new module that I purchased and never installed.

I haven't taken it out on the water but unless the spacing in the switch itself isn't correct the system should work properly.

Thanks everyone for their input!

 

[alldodge]

Sounds good, you should be good now. Sure sorry about my first comment which started you down the wrong path

 

[Topvader1]

No worries. I would have just given the distributor a little bit of a tune up! I cant express how excited I was when the motor started to stall out when I grounded out that module last night. And it was more rewarding and much less expensive then taking it to the marina! Thanks again.

 

[Fishermark]

Glad you got it fixed!