Quote:
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My truck never had a tach installed in the cab.
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There aren't many reasons to have a wire from coil- running into the cab. In a points ignition like our trucks had, the coil- connects directly to the distributor. If the added wire isn't for a tachometer or RPM measuring device, there's a very good chance it's for an aftermarket electronic ignition. You should follow that wire and see what's at the other end.
Relay wiring is fairly simple.
Code:
/
Bat+ /
-------- o-------------- HEI BAT+ Terminal
)()()(
Ign | |
From | |
Sw----- --------Ground
When the switch is on, ignition current routed through the coil of the relay to ground (terminals 85 and 86) closes the relay and allows current to flow from battery to the HEI (terminals 30 and 87).
HTH