Intermittent spark......

smokedchevy · 09-17-2007, 12:55 AM

Hey Guys,

Well I'm having problems with a Pertronix Ignitor and Flamethrower coil. I just put another 302 into my 65 coupe. I'm at the point of starting it up, and I can't get it to light. At first I got a backfire through the carb. Then I got the dreaded, " it ain't gonna start crank", you know the one where you can tell there is no fuel or spark. So, I hook up the old coil and pull the coil wire off to crank it over and check for spark in the dark garage. Blue flames everywhere. So I'm thinking the new Flamethrower coil is bad. Proceed to crank the engine and nothing. I throw a Voltmeter on the ignition wire going to the positive side of the coil and it only reads 6 volts. So I un-hook the ignition wire and it reads 12 V with the ignition on. I throw it back on the coil and it reads 6V with the ignition on. So now I'm thinking what the "fudge". I unhook the ignition wire again and it reads 12V. Hook it back to the coil, 6V. If I unhook the black wire going to the negative side of the coil, the positive side will read 12V.????? I don't get it.

According to Pertronix the Ignitor has 2 wires. The red wire goes to the positive side of the coil and the black to the negative. Then you connect the 12V ignition wire to the positive side of the coil with the red wire. This is how I have it hooked up. Everytime I hook up the black wire up, the voltage drops to 6V on the positive side and that won't light the fire at all. Does anyone have any ideas?? I hear great things about Pertronix, but I'm tearing my hair out. Any response appreciated!!

smokedchevy · 09-27-2007, 03:18 AM

Not a single response? Well, I guess not too many classic mustang owners around. I got it sorted out. If anyone runs into this problem email me. I will sell the answer for one dollar.

Gearhead999 · 10-14-2007, 07:55 PM

Glad you got it running. Sorry, wasn't around/on line recently or I would of tried to help.

The cars wiring should have a resistor wire built into it so that the voltage to the points will only be 6+volts while running and 12 at crank.

I've installed many pertronix and have only had problem with one. And it was a 6 cylinder Falcon.

goodyear1984 · 11-02-2007, 12:34 AM

make sure the coil is right some have an external resitor and some internal

09-17-2007, 12:55 AM	#1
smokedchevy Registered Member Join Date: Jun 2000 Location: ventura,CA Posts: 438	Intermittent spark...... Hey Guys, Well I'm having problems with a Pertronix Ignitor and Flamethrower coil. I just put another 302 into my 65 coupe. I'm at the point of starting it up, and I can't get it to light. At first I got a backfire through the carb. Then I got the dreaded, " it ain't gonna start crank", you know the one where you can tell there is no fuel or spark. So, I hook up the old coil and pull the coil wire off to crank it over and check for spark in the dark garage. Blue flames everywhere. So I'm thinking the new Flamethrower coil is bad. Proceed to crank the engine and nothing. I throw a Voltmeter on the ignition wire going to the positive side of the coil and it only reads 6 volts. So I un-hook the ignition wire and it reads 12 V with the ignition on. I throw it back on the coil and it reads 6V with the ignition on. So now I'm thinking what the "fudge". I unhook the ignition wire again and it reads 12V. Hook it back to the coil, 6V. If I unhook the black wire going to the negative side of the coil, the positive side will read 12V.????? I don't get it. According to Pertronix the Ignitor has 2 wires. The red wire goes to the positive side of the coil and the black to the negative. Then you connect the 12V ignition wire to the positive side of the coil with the red wire. This is how I have it hooked up. Everytime I hook up the black wire up, the voltage drops to 6V on the positive side and that won't light the fire at all. Does anyone have any ideas?? I hear great things about Pertronix, but I'm tearing my hair out. Any response appreciated!! __________________ 92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters 65 Mustang 13.50 107mph 3000' ALt. 65 Falcon Straight Axle Drag Car

09-27-2007, 03:18 AM	#2
smokedchevy Registered Member Join Date: Jun 2000 Location: ventura,CA Posts: 438	Re: Intermittent spark...... Not a single response? Well, I guess not too many classic mustang owners around. I got it sorted out. If anyone runs into this problem email me. I will sell the answer for one dollar. __________________ 92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters 65 Mustang 13.50 107mph 3000' ALt. 65 Falcon Straight Axle Drag Car

10-14-2007, 07:55 PM	#3
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	Re: Intermittent spark...... Glad you got it running. Sorry, wasn't around/on line recently or I would of tried to help. The cars wiring should have a resistor wire built into it so that the voltage to the points will only be 6+volts while running and 12 at crank. I've installed many pertronix and have only had problem with one. And it was a 6 cylinder Falcon. __________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic

11-02-2007, 12:34 AM	#4
goodyear1984 Registered Member Join Date: Dec 2006 Location: new york Posts: 482	Re: Intermittent spark...... make sure the coil is right some have an external resitor and some internal __________________ 347 stroker all forged,arp everything,stud mains w/girdle,7qt pan,full roller, custom cam, aluminum heads swirl valves 5 angle valve job.quick fuel 750,areomotive pump,cobras w/nitto drags,and m/t et drags for the track, ford racing 373 gears,centerforce clutch,tko500,underdrive pulleys,bassani x-pipe,flowmasters ^best et so far 11.6 1.61 60ft coming soon 9sec et's 1992 mustang gt 2001 gmc 1500 4x4 78 century boat 92 skidoo

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