Resistor wire location at fuse block

[BDD]

The P.O. did many things that I have had to sort out one by one. One thing that he did was to replace the resistor cable with a very thin gauge black wire. I can't see how this could work but the car does start and it runs. I can see where it connects to the positive terminal of the coil but cannot find where it connects to the fuse block.

The resistor cable is supposed to connect at a terminal that is at the bottom of the fuse block (the side that is closest to the firewall) and at fuse #5 (the third fuse from the right)....right? There are only some heavy gauge grey wires here from what I can see.

He must have connected his replacement resistor wire somewhere else or may have spliced it onto some other wire.

When I install a Pertronix ignition I was going to run a red, 14 gauge wire from the fuse block terminal where the resistor wire should have gone and to the positive side of the 3 Ohm coil, correct?

[BDD]

Looking at the wires, apparently the fuse block is rotated 180 degrees from how it is shown in the schematic. The new 14 ga. wire works at the corresponding location. The heavier gauge wire would have to be a better set up than what was recently there.

[wrench459]

Originally Posted by BDD Looking at the wires, apparently the fuse block is rotated 180 degrees from how it is shown in the schematic. The new 14 ga. wire works at the corresponding location. The heavier gauge wire would have to be a better set up than what was recently there.

14 gauge wire is good for up to 5.9 amps max.
As long as the coil current is under that your golden.

[BDD]

Thanks. That's good info. to have. I believe that 14 ga. wire was recommended for the Pertronix without a resistor wire so it should be the same here.

[trlmr]

Wire Gauge Tables
It matters how long the wire is for amp ratings. 5 feet of 14 gauge will handle more than that as this table shows.

[wrench459]

Bottom line is how many amps are flowing.
A three ohm coil will pull close or a little over 4 amps.
But if you changed the coil all bets are off.

[BDD]

It's a light blue Bosch coil with an internal resistance across the primary coil of just over 3 Ohms, +post to -post.

[wrench459]

Originally Posted by BDD It's a light blue Bosch coil with an internal resistance across the primary coil of just over 3 Ohms, +post to -post.

I don't know about the blue top coils. But the primary res. is cool. That 14 gauge wire will work just fine.

If your turning some rpms and breaking up look into the coil ramp time.
A two ohm coil will pull more amps(6) In the higher rpms theres less coil charge time.