Shift Interupt (old style) with new Delco EST Distributor hookup

[piasajake]

I originally had a 1985 Mercruiser 140 GM engine, which I replaced with a new GM 3.0 engine (4 cylinder). It came with a new GM Delco Voyager EST Distributor. The instructions I got for hooking up the shift interrupt switch are probably for a newer style system than what I have. I was wanting to know if anyone could help out on hooking up an older style switch with my new engine and electronic distributor setup? I don't think it is probably to complex, but I don't want to hook up something wrong.

Here are the instructions that I got with the distributor:

OMC SHIFT INTERRUPT SWITCH HOOKUP

1. Locate the shift interrupt switch on top of the engine.
2. Cut the Light-blue wire on both sides of the switch.
3. Connect one side of the Light-blue wire to any keyed 12 volt source. Connect the other side of the Light-blue wire to the SINGLE BLACK wire, which was supplied with the ignition wiring kit.
4. Plug the SINGLE BLACK wire in the distributor.
5. The shift interrupt hookup is complete.

NOTE: Make sure that the Travel on the switch is adjusted so it snaps back to the OFF position.

 

[padn]

Re: Shift Interupt (old style) with new Delco EST Distributor hookup

I've done the same replacement - I had a 1979 Mercruiser 140 - block was replaced with a GM3.0 longblock with Delco EST. Your modification description is correct. I've made a modified wiring diagram I can send to you if you want (to big to attach in this forum).

 

[piasajake]

Re: Shift Interupt (old style) with new Delco EST Distributor hookup

I found a couple wiring diagrams that I think will get me there, but any other input or help would be appreciated.
You can send the info to piasajake@prodigy.net

Thanks!