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Old 02-18-2016, 08:00 PM   #117
ray_mcavoy
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Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,358
Re: 3 speed overdrive!!, now about getting it in.......

Quote:
Originally Posted by ncoonen View Post
I have gone over the wiring and hoped to setup the kickdown switch as originally intended but the 292 will be using an HEI distributor. Is there a way to setup the ignition interrupt - which is necessary to drop out of overdrive - with HEI? I think there isn't a way to do this without compromising (that is, ruining) the HEI distributor electronics.
You're right, grounding the negative side of the coil (as is done with the stock interrupt) can damage the HEI module.

However, you could use a relay to interrupt power to the HEI. Run the HEI power feed through the relay's N.C. (normally closed) set of contacts. Hook one side of the relay's coil to power and the other side to the OD interrupt wire.
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