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Old 02-15-2018, 02:57 PM
sholcomb72 sholcomb72 is offline
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Pertronix Ignitor II question

I'm wiring up my Pertronix on my old 73 ford 302 engine and the question is do I keep the positive wire from the I terminal of the starter relay to the positive on the coil? The old set up was a + from the electric choke to + on the coil and + from the starter relay to the + on the coil. As I understand it the + from the relay is an exciter to boost voltage at start up only. Pertronix wasn't a lot of help so thanks for your input guys.
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Old 02-15-2018, 03:12 PM
waterlogged882 waterlogged882 is offline
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Quote:
Originally Posted by sholcomb72 View Post
I'm wiring up my Pertronix on my old 73 ford 302 engine and the question is do I keep the positive wire from the I terminal of the starter relay to the positive on the coil? The old set up was a + from the electric choke to + on the coil and + from the starter relay to the + on the coil. As I understand it the + from the relay is an exciter to boost voltage at start up only. Pertronix wasn't a lot of help so thanks for your input guys.
Are you installing a Flamethrower coil as well as the EI module?
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Old 02-15-2018, 03:15 PM
sholcomb72 sholcomb72 is offline
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yes the Flamethrower II as well.
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Old 02-15-2018, 03:20 PM
waterlogged882 waterlogged882 is offline
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Originally Posted by sholcomb72 View Post
yes the Flamethrower II as well.
You're good then. Instead of me babbling and being a middle man; here are two schematics I have used on several installs.

If this isn't clear, speak up and myself or other knowledgeable folks will assist.

I think back in the day, the choke was part of the hot loop (all-inclusive). Don't hesitate to branch out if it works better for your setup. You will either bypass or jumper the resistor.

I would also recommend to add a new alternator with the single wire / built-in exciter. Much better setup and less than $75 for a new 95A alternator. I have part numbers if it is of interest to you.

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Last edited by waterlogged882; 02-15-2018 at 03:37 PM.
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Old 02-15-2018, 03:35 PM
sholcomb72 sholcomb72 is offline
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thanks a lot for taking the time to attach the diagrams and reply. My old Ford 302 doesn't have a resistor it had what the service manual calls a resistor wire that is really just 4' of 16ga wire from the + electric choke terminal to the + coil terminal. I guess I don't see the harm in leaving the + from the starter relay (solenoid) to the coil.
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Old 02-15-2018, 03:41 PM
waterlogged882 waterlogged882 is offline
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Originally Posted by sholcomb72 View Post
thanks a lot for taking the time to attach the diagrams and reply. My old Ford 302 doesn't have a resistor it had what the service manual calls a resistor wire that is really just 4' of 16ga wire from the + electric choke terminal to the + coil terminal. I guess I don't see the harm in leaving the + from the starter relay (solenoid) to the coil.
Follow the wiring diagram as shown for the Pertronix.... If there is no resistor, that is OK too. Just run the purple wires as shown without a resistor. With this setup you are upgrading, you do not need a resistor.

Keep an update and best luck. I have an older diagram that addresses the 4-wire alternator if you need it.

You also have an amperage gauge if I recall.... Not a bad time to convert to a volt gauge.

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Old 02-15-2018, 04:31 PM
sholcomb72 sholcomb72 is offline
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A volt meter would be a nice upgrade but the old 73 is still very original down to the 8 track player so I would like to keep it that way. That's the old Cypress Gardens water ski show stadiums in the back ground of the picture.

Last edited by sholcomb72; 02-15-2018 at 04:44 PM.
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Old 02-15-2018, 04:40 PM
sholcomb72 sholcomb72 is offline
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Right down to the cigarette lighter.

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Old 02-15-2018, 05:21 PM
waterlogged882 waterlogged882 is offline
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Very OEM and nice looking indeed. Thanks for sharing the pictures.

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Old 02-15-2018, 07:10 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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Great boat! You do not need the exciter wire. You are correct that it bypasses the resistor wire during cranking only to give full battery voltage to the points, then reduced the voltage so as to not burn out the points.
Did you get the coil with .06 ohms resistance? If so, you don't use the resistor wire.


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