Good info, should get you there. I use a relay to power the HEI, it can get you more voltage at the distributor, and you don't have to remove the original resistor wire, 9 volts will switch the relay. If you ever want to go back to pure stock the wire is still there. After installing a 140 amp SI alternator, my dash volt gauge still showed only 12 volts. I checked the voltage from the alternator through the firewall junction box, to the ignition switch and from there to all the components and lights. Voltage drop was amazing. I had 14 volts at the alternator, 13 volts at the junction block, 12 volts at the ignition switch, 11 volts at the light switch and only 10.5 volts at the headlights. there was a bit of a voltage drop at every junction. 46 years of age, dirt and corrosion. I've since cleaned things up and replaced a few things for better circuits. I did run the power wire for the ignition relay from the main power source off the alternator and get 14,8 volts at the distributor. One case where more really is better.
Hey Bluebird, would be interested in seeing like a wiring diagram on how you ran all that, you by chance have one? I like the idea, I am just still a little confused on how you ran the wires and is the only purpose for doing it the way you did was for more voltage to the HEI? Also, do you have A/C and a lot of extras for using a 140 SI alt? What 140 Alt do you use? Sorry, not trying to hijack!
