[Held for Ransom]

Originally Posted by 1973Formula

If a picture is easy, that would be nice. Do you know where it connects on the instrument panel? I know one wire goes to the tach, and the other piggybacks with another plug that I don't know about....

The set of wires goes to the tach. The single pink wire goes to the IGN plug-in on the fuse holder. The single brown wire goes to the coil. My '74s are different than the '72-3.

Bill, I can't believe the '70-1 units needed a 30A fuse, wow. Probably another reason they went with a different style of induction. I believe mine are less than 5A.

Pictured are the '73 Pontiac Service manual, reproduction '72-3 harness and one of my '74s plug-in.

[70RAlll]

Originally Posted by Held for Ransom

The set of wires goes to the tach. The single pink wire goes to the IGN plug-in on the fuse holder. The single brown wire goes to the coil. My '74s are different than the '72-3.

Bill, I can't believe the '70-1 units needed a 30A fuse, wow. Probably another reason they went with a different style of induction. I believe mine are less than 5A.

Pictured are the '73 Pontiac Service manual, reproduction '72-3 harness and one of my '74s plug-in.

HFR- "need a 30 amp fuse?" not sure why, maybe something to do with the different design. After 72,I think starting in 73, the rear of the tach had two spades. One went to the coil and the other recieved a power feed from the fuse panel. the 70-71 models did not have that power feed from the fuse panel. all they had was a single spade that hooked the coil directly to the tach, with no external power delivery like the 73 and up models. may have started in 72, not sure, but definately 70/71 models had this style..

[1973Formula]

Great replies. Thanks for the pictures. On my '73 the fuse block end of the pink wire piggy backs on another wire/plug, not sure what it is. And to clarify on the firewall hole. It is definitely drilled on the outer dimple, or closest to the driver fender.

Later-