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Old 08-08-2010, 08:43 AM   #1 (permalink)
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Ballast resistor

Getting ready to install Pertronix ignitor 3 ignition system. Does anyone know where the resistor wire is at on a 68 Galaxie? I am getting 12 volts to the engine connector on top of the intake. But i am getting 9 volts at the coil is the resistor in the connector? Or do I have some voltage drop in the connector?
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Old 08-08-2010, 09:29 AM   #2 (permalink)
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Re: Ballast resistor

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Originally Posted by 68 390 convert View Post
Getting ready to install Pertronix ignitor 3 ignition system. Does anyone know where the resistor wire is at on a 68 Galaxie? I am getting 12 volts to the engine connector on top of the intake. But i am getting 9 volts at the coil is the resistor in the connector?
Hey Mr. 78490c,
Unless you have a "Ballast Resistor" installed, AND unless a '68 is different than a '64, the Brown wire that goes from Starter Solenoid to the wire that goes to the Coil IS the resistance wire.

Quote:
Or do I have some voltage drop in the connector?
Nine volts at the coil while the engine is running (as opposed to being started) is just fine. The time you want 12 volts at the coil is when you are starting up. And the circuitry through the Start Switch sends 12 Volts to the Coil. Then when you let off of the key into the "Run" position, the voltage goes back to 9 Volts because it is now going through the resistance in the Ballast Resistor, or the Resistor Wire.

Check the voltage at the coil with the Start Switch engaged. If you get 12 Volts, fine. If not, then you're asking the engine to start with less with than 12 Volts.

HTH

JC
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Old 08-08-2010, 02:06 PM   #3 (permalink)
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Re: Ballast resistor

I don't know why I put ballast resistor in the title by I mean resistor wire. I found out why I had 12 volts with the conector unhooked my coil wire also goes to my electric choke that was still hooked up. From what I can find the wire is under the dash but I cannot find it. I may run a relay to power up the coil wire anyways. The coil I am getting can run some pretty high amps and I don't want to burn up the iginition switch.
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Old 08-08-2010, 03:30 PM   #4 (permalink)
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Re: Ballast resistor

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Originally Posted by 68 390 convert View Post
I don't know why I put ballast resistor in the title by I mean resistor wire. I found out why I had 12 volts with the conector unhooked my coil wire also goes to my electric choke that was still hooked up. From what I can find the wire is under the dash but I cannot find it. I may run a relay to power up the coil wire anyways. The coil I am getting can run some pretty high amps and I don't want to burn up the iginition switch.
That's the best answer. Leave the choke on the original wiring, and also use the wire to energize a relay directly from battery power to both the coil and the PerTronix. It is essential the module get full system voltage to work properly. That is the single most common reason folks have issues with them.

The resistance wire is normally PINK and goes from the switch (or inline shortly after) to the firewall connector, where it changes color and is no longer resistance wire. If you can't find a PINK wire under the dash, trace the coil wire to the firewall and test the resistance from there to the ignition switch to confirm you have one, and what color it is (sometimes RED/GRN). The BROWN wire from the I terminal of the solenoid provides full +12v to the coil when cranking (starter engaged) only. The BLU/RED wire runs from the switch to the solenoid S terminal to energize the solenoid. Have fun and let us know how you like it.

David

EDIT: PS - you can test to see if you have a resistor inline with a volt meter, but only if the engine is running. The stock coil terminal wire should test at a full +12v KOEO (Key On Engine Off) and around +6v KOER (Key On Engine Running). That's the telltale there is a resistance if you have no resistance (ohm) meter to use.
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Last edited by PSIG; 08-08-2010 at 03:37 PM.
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Old 08-08-2010, 06:02 PM   #5 (permalink)
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Re: Ballast resistor

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The BROWN wire from the I terminal of the solenoid provides full +12v to the coil when cranking (starter engaged) only.
Hey Mr. P,
Now that I think about it, you know, THIS is obvious, but I didn't see it till YOU mentioned it. I had heard that the Brown Wire WAS the "resistance wire" and I just assumed it to be so without checking or questioning.

Nice goin'

JC.
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