68 C10 Yellow wire from firewall to starter/coil.

[dmjlambert]

Sorry, I should have pointed out, an exception to the diagram colors matching the wire colors is 20W/OR/PPL, after all these years on your truck it has faded to be just a plain white cloth covered wire. That is the resistor wire that powers a standard points distributor/coil. That is the one you replace with a pink wire to power HEI. You can buy a ready-to-use wire if you want, and install it like this> http://67-72chevytrucks.com/vboard/s...d.php?t=708975