Works awesome! Thanks!

I;m having the same difficulty with finding my correct wires. I posted the "converting from TBI to carb" thread. The switch on my cutoff is a normally closed switch. So I'm thinking by what you all have said I do want the run the ground through it. I may think this backwards but if this is true then the current is coming from the coil and going to ground.
Cash68, Hope your day at the lake was successful.

You sure it's normally closed? All the mercrusier ones are normally open.

cash, check out these pics. I think I've tracked down the interrupt switch in the first 2 pics. Correct me if I'm wrong, it's on the inside of the starboard manifold

The only wire I can find by the Dizzy, is a white one w/ a blue stripe shown in the pictures below. It matches two of the wires from the switch (obviously it can only be one of them haha) is that what I'm trying to tie into the ground wire(-) from the dizzy/coil?

The third pic is me holding the 3 wires running from the coil in the cap down to the dizzy. The dark is ground(-), pinkish is power(+), and the one spliced with tape is the tach wire.

So presumably I'm splicing the white with blue stripe wire from the interrupt switch, into the ground wire that runs from the coil to the base of the dizzy. Right or wrong?

Ideas anyone?

machloosy,
First, is this a stock thunderbolt iv? If it is there should be a white/green wire coming from the interruptor switch. This white green wire then goes to the distributor. There is another white/green wire that goes from the dist. to the (-) side of the coil. This is how it is hooked up from the factory. If the white/green wire on the interrupter switch is just hanging in space then hook it to the (-)side of the coil.

If it is some after market/rigged dist., still hook the white/green wire from the interrupter switch to the (-)side of the coil. This will ground the ignition and kill the engine for a moment allowing you to switch in/out of gear.

The other side of the interupter switch should be hooked to ground.

It's not stock tbolt iv. Accell HEI. But that's exactly what I needed to know. I figured that was it, but want to limit splicing wires. Good to know I got it right. It'll be nice to dock w/out white knuckles

Cool, I hear ya there. Had one go bad on me once and I found that if you blipped the throttle real quick you could pull it out of gear as the engine slowed back down. I got good at that real quick.