If you are talking about the three wire conector that comes out of the main
body of the HEI, that actually plugs into the cap and connects the coil
mounted in the cap to the distributor. Also on the cap right next to where
the three wire connector goes will be another connection for a two wire
plug. One wire is +12v, and the other is for the tach. They will be plainly
labled on the cap.
The +12v connection needs to go to a point that is only hot when the key is
on. Otherwise your engine will never shut off. Or at least not 'till it runs
out of gas. :) I ran mine from the fuse box. Make sure you use at least a 12
gauge wire, as the instantaneous current draw can be quite high.
This wire should already be there if it was on a computer controlled car.
If it was between 1974 and 2000 it pretty much got one form or another of
the HEI unless it was the LS1 or one of the other distributorless engines
like the 3800. After 81 it most likely would have been computer controlled.
When swapping into a pre-1974 Camaro (and some early 1974's) you would need
to bypass the original +12v wire and go into a keyed +12v source because the
wire is a resistor wire and will not supply enough amperage to run an HEI.
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