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Pertronix Ignitor Install - 72 302

jackwagon

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Feb 24, 2017
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Rookie mechanic here.
I found a few threads on the pertronix ignitor reviews, but could find much on the install. If there is something I missed please point me to it.

I got confused when the instructions talk about a ballast resistor.
I thought I would ask anyone here with that model year with the set up is.

They do have instructions for determining this, but I didn't have my meter with me last night.

I'm planning on changing the coil as well, to a Pertronix flamethrower.

The existing set up has wire with red end (push on) going to coil, and a red green wire with black end - going to coil.
So now with two wires from the ignitor, and red green wire, am I assuming I probably need to cut off the push on fitting and add a ring connector so I can connect these 3 wires to the coil.

Sorry no pics, yet. I'll get some
 

dave67fd

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Not sure if you have purchased yet but if not, opt for the Ignitor II. Has reverse polarity and over current protection as well as adjustable dwell. Also make sure you confirm your using "Resistive" plug wires not solid core.
 

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Joe473

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Not sure if you have purchased yet but if not, opt for the Ignitor II. Has reverse polarity and over current protection as well as adjustable dwell. Also make sure you confirm your using "Resistive" plug wires not solid core.
Pertronix III adds the Rev limiter. Didn't think I would need it with the mild build and 4100 carb on a stroker. I'm very happy I spent the extra couple of Bucks on it. It comes in handy when my foot gets heavy and tires get loose....

On the voltage issue buy the new coil if you eliminate the resistor wire. The old coil was meant to run on reduced voltage through that wire and I believe a brown wire off the I terminal of the solenoid to send full voltage while starting. Get a coil meant to run and start on full voltage if you eliminate the resistor wire.

A quick workaround to get truck driving without eliminating resistor wire and upgrading coil. I believe there is a blue wire on top of engine. Originally meant for idle solenoid in some harnesses but many times not used. Confirm it is hot in start and run. Power pertronix from this and leave existing wiring on coil. I ran like this for over a year with no issues.

Sent from my SM-G900V using Tapatalk
 

DirtDonk

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Thirty plus years of selling Ignitors and they still can't make the instructions understandable to normal human beings!
Been complaining about their instructions all that time.

Like the others said, the Red w/green wire that is currently on your coil is the business end of that resistor wire from the key. It's often pink under the dash but turns back to the Red w/green as it exits the firewall to your engine.

You should actually have that Blue wire Joe mentioned on your '72. Not sure when (or if) they quit using it, but all the '71's and '72's I've known had it.
If you still use your idle solenoid on the carburetor and don't want to lose it's function to power the ignition, you can use a relay triggered by the old Red w/green wire to power your Ignitor and coil with a full 12v.
If you're not sure what a relay does or how to wire it up, ask away. Many here have gone that route instead.

Basically though, a relay is simply a "remote switch" that's connected directly to the battery with a new wire, so that your key and resistor wire turn on the relay, which then lets the full 12v from the battery go to the ignition.
Strange at first, but simple in concept once you get the whole thing.

Sorry if you knew all that already, but if not, it's worth hearing about.

Paul
 

House

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The Pertronix specs state that the minimum operating voltage is 8V, so even if you run the factory resistance wire and have at least 8V to the coil you shouldn't have a problem.
 

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dave67fd

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Thirty plus years of selling Ignitors and they still can't make the instructions understandable to normal human beings!
Been complaining about their instructions all that time.

Probably why many fry them up but I didn't have any difficulty understanding the instructions or installing mine but then again maybe I'm not all human;D
 

DirtDonk

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haha! Maybe not. The test is if you can still twist yourself up under the dash of a Bronco and smile at the same time.

Thanks House. Do they say that's for all units? Or is that chart just for a certain model?

Paul
 

House

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Thanks House. Do they say that's for all units? Or is that chart just for a certain model?

Good question Paul, I only asked about one for a V8 in a 66-77 Bronco. ;D

That being said:
Ignitor needs 8V
Ignitor II needs 8V
Ignitor III does not specify, but you can set the rev limiter with a 9V battery, so...???
 

DirtDonk

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That's good to know. Thanks.
The good news is that we won't have near as many faulty ignitions due to low voltage like we used to.
The bad news is that now it's going to be even harder to diagnose one that's not running right!;D

Low voltage used to be the real demon in the mix and the bane of Pertronix's existence.
Sounds like that's a think of the past unless someone does connect it to the resistor wire and it's got too much resistance. I bet as it gets closer to that 8v and then goes below, things start to go wonky still.

Paul
 

House

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Yes, I agree.
Easily diagnosed with a temporary jumper wire from the positive battery post to the positive side of the coil though... ;)
 
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jackwagon

jackwagon

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Thanks for all the input.
The instructions were acceptable. I just really didnt want to have to run a wire back underneath the dash if I can avoid.
I'm only getting 6V to the coil, and as mentioned the Ignitor wants 8v.
(And I think I might still be able to return for I2 or I3, also I bought the flame thrower coil - now I'm questioning if will work with this set up. Space issues and I think I need the Flamethrower II 45K volt version)
So I like the idea of using the Blue wire. I dropped a pic of mine in my garage. (Its more blue green, and then end of it is all melted. Came that way from previous owner.)
Need to check if its hot in "on" and "run".

So I was going explain how I intend to hook it all up - then got turned around in my head.
So I'll just ask Joe/Paul/House/whoever how best to wire it up.
And any insight on which coil I need.
The old one works, but is beat up and thought I would replace while I'm at it.
Thanks
 

DirtDonk

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Perfect! Since it was unusable in it's current state and you'd have to put a new end on it anyway, it might just be the perfect wire to utilize.
I don't know if it's going to be hot in START, but it might. If so you're in good shape.

But even if not, remember that you have your Brown wire on the starter relay that supplies 12v when the starter is engaged. So that issue is very surmountable.

I prefer to use 12v rated coils personally. The more I can use normal wire, and take full advantage of the higher voltage in the system when the engine is running (alternator putting out 14.5 or so) then I opt for that.
So if the coil you purchased is one of theirs that is expecting to see 12v in the system, then just use it.
You can even keep the Ignitor too, unless you just want to swap it to another model for other reasons.

As far as beat up, that's good enough reason for replacing an old coil. The Ford coils were generally acknowledged as one of the best made back in the day, and have proven to be among the most reliable as well. How many other vehicles do you hear about that are still using 50 year old ignition coils with good results? Not many I bet!
That said, they will usually eventually fail, so having new isn't always a bad thing.
Just keep the old one in your spares box.

Did you ever list your coil's actual part number? Knowing that would help us make recommendations for or against I would think.

Paul
 

DirtDonk

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The way I'm reading the information in their book, that coil is just the one you want for the 12v system with NO resistor wire.

Should be good to go then.

Paul
 

dave67fd

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Again, if you don't have, don't forget Resistive "plug" wires. Solid core will cause havoc and can result in failures.
 
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jackwagon

jackwagon

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Blue wire is hot, in On and Run.
So we have fire.
I assume this will go to the + side of the coil?
Then I can remove the red-green wire?

Problem is the screw to condenser is stripped and stuck.
Gonna have to drill or dremel it out.
I was just gonna cut the wires as leave it in there, as the ignitor fits in there fine.
But probably not the right thing to do.

Coil is just going to barely fit in there.
Went to a smaller fuel filter to make a little more space.

Any thoughts?

Oh , and it highly likely the distributor might jacked up. Tried to pull it to work and stripped screw and it was locked in place. So if I have any timing issues, I suspect I'll have issues making adjustments.
Have a buddy coming to take a look, to see if we can free it.

thanks again.
 
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jackwagon

jackwagon

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Actually, just realized Donk specifically said "Start".
Didn't check that.
Just on, and run.
I'll check "start' position as well.
Wouldnt think it would go cold when starting, but I'll double check.
 

DirtDonk

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Blue wire is hot, in On and Run.
So we have fire.
I assume this will go to the + side of the coil?

Yes. Positive side of the coil, AND to the Red wire from the distributor.
In this situation you can connect them all to the positive side of the coil and it acts as a common power source.

Then I can remove the red-green wire?

You "can" do that, if it's in the way. Or you can leave it, if that's easier.
It's not competing, and is just a backup power source if anything happens to the main one. If the Blue wire ever dies for some reason, it might run rough and try to die, but the Red w/green wire might just keep it running long enough to get home.
If there's some hole in that plan, I'm sure someone will know and point it out.

Problem is the screw to condenser is stripped and stuck.

Why is it always the small things!

I was just gonna cut the wires as leave it in there, as the ignitor fits in there fine.
But probably not the right thing to do.

Surprised there is room for both, but if so, and you can't get the screw/plate off, maybe it's not the end of the world.

Went to a smaller fuel filter to make a little more space.

How so? Is there a filter in the front of the carb, or is there an inline filter somewhere that's in the way? Smaller won't have as much filter area of course, but it should still get the job done. Would be a restriction on a high-performance engine maybe (or maybe not) but should be fine here.
You might end up changing it more often though.

Oh , and it highly likely the distributor might jacked up. Tried to pull it to work and stripped screw and it was locked in place. So if I have any timing issues, I suspect I'll have issues making adjustments.
Have a buddy coming to take a look, to see if we can free it.

Careful adding torque and kung-fu grip to the distributor if it's stuck. Start it soaking in penetrating oil right now so that it's had a chance to dig through and maybe disolve some of the corrosion and/or burned on oil that's holding it in place.
This was rarely a problem 30 years ago (on these particular engines at least), but now that they've sat in the same position on the same engine for the last 30 or so years without moving, it's going to come up more and more I'm sure.
It's a very common scenario on the 335 series engines however (351C, 351M and 400) and their distributors used to get stuck all the time. Many a distributor body was broken off inside the block while trying to remove them.

So finesse is the name of the game here. Soak, soak, soak in your favorite fluid distributor-loosener product and wait. Tap, tap, tap it with a hammer very lightly to send some shock loads into the body. Tap directly sideways, and tap in a "turning" rotational way against the vacuum advance (very gently!) boss on the side.
Muscle it a little bit here and there, but here again, don't play too rough with it just yet.
You might just get lucky and it pops right into submission. More often than not the 302's and 351W's release without carnage. Unlike the typical 351M that is.

Didn't check that.
Just on, and run.
I'll check "start' position as well.
Wouldnt think it would go cold when starting, but I'll double check.

Was thinking that's what you meant when you said "on and run" in the same sentence.
Officially speaking, so that we're on the same page, the active positions (besides OFF of course;D) are ACC, RUN and START. Sounds like you meant ACC (Accessory) and RUN?
So yes, power in START is fairly important. Not always critical, but it's a component of a properly operating ignition system.
Even if it does not have power in START, you can try it anyway to see how it works.

Oh, and the reason that many of the Accessory circuits don't have power in START is just the way the ignition switch is designed. They didn't want power surges and power drains going through the whole truck while the starter motor (the biggest power hog on a vehicle like this) was spinning so many of the circuits deactivate when the key is in the START position.

It's normal.

Paul
 
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jackwagon

jackwagon

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Thanks for all the info.
Yes, its hot in start - voltage does drop to 10-11 volts, but acceptable.
*Update - just saw you tube video that indicated that on some vehicles the ballast is bypassed during start and 6v is normal in run/on. But that seems to me that 6v is below what recommended on the flamethrower coil.
I'm going to check that on the original resistance wire, just out of curiosity.
But I don't think I will change my game plan.

Putting it back together today. I'll let you know how it works out.
Then we shall see how the dizzy issues work out.
 
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