Re: Transmission wiring
You only need the relay if you are going to use the neutral safety switch on the side of the transmission for an actual neutral safety switch. Most people will just use the existing NSS on their column and not the trans one.
But if you want to use it, it is wired like this-
The wire from the ignition switch, the one that is hot when you turn the key to "crank", usually purple on older GM vehicles, will go to pin E, the pink wire. Then pin G the yellow wire will go to terminal 85 on the relay. Terminal 86 will be grounded. Terminal 30 will be a constant power, with about a 40A fuse and then terminal, 87 will go to the starter solenoid.
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