Re: Resister in Centech harness?
OK, Here is the Rub, Bub....
You DO need a resistor on your new harness for the '78 ignition.
The only exception is if you are using a MSD module INSTEAD of the factory module.
(If you are using the factory module, AND the MSD module, (smog set up) you still need the resistor.)
Ceramic 'Ballist' resistors (a misnomer, ballist suggests that is is there to balance someting, and it is not.
In this case, it works more like a restriction to slow things down a bit....)
Ceramic resistors are notorous for letting moisture into the resistor materal, and going bad, but they are cheap to replace, and easy to install.
I recommend SPLICING into (Not cutting the wire) the coil power wire and adding a Ford style Resistor Wire.
You will need a full 12 Volts from the ignition to run the stock DuraSpark Module, and you will need the resistor wire to power the coil, and this sloution gives you both.
The orignal wire powers the module with a full 12 volts from the key switch, and the coil gets the proper resistance via the resistor wire.
This is the way your stock wiring harness was set up, and it's the best way to do your new harness.
Very reliable, cost around $10 for the resistor wire. AutoZone part #
THE MODULE ALWAYS GETS A FULL 12 VOLTS.
Don't let anyone tell you it gets resisted power, or you will be changing a lot of modules....
"I Have The Body Of A God... Buddha"