electronic iginition ???'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BAGNDRAGIT · 12-30-2010, 09:32 PM

ok in my quest to get my truck running again i have found that my spark is inconsistent.

during cranking there is no spark. but after i stop cranking it discharges (mind you this is straight out of the coil) i have an electronic ignition conversion. the black wire is to the coil neg and the red is to the coil pos. and i just replaced the coil. so im thinking the module is bad. there is no resistance between the two module wires. is that normal. if someone has one they could test i would really appreciate it.

oh btw its a 71 250 inline.

BAGNDRAGIT · 12-31-2010, 12:01 AM

ttt

anyone?

**VetteVet** · 12-31-2010, 12:40 AM

How are you powering the ignition and is it a regular HEI or a pertronix setup. If you used the original resistance wire for the points coil it will not provide enough voltage to an electronic ignition to saturate the coil and get a strong spark.

the yellow wire from the starter has 12 volts on it which should provide spark for starting if it is still wired into the system, but after the starter disengages the normal running voltage is 9 for a points ignition.

BAGNDRAGIT · 12-31-2010, 01:38 PM

i have run 12v to the coil and the pertronix unit. and still have the same problem.

does anyone have a pertronics unit they can test the resistance on?
or tell me how to tell if they are bad?

**VetteVet** · 12-31-2010, 03:52 PM

Here is a google page on testing the module and the coil. If you are running the original coil you will need the resistance but if you are running the pertronix coil then 12 volts should be Ok. Another thing to figure is the gap between the module and the pickup. Make sure it is correct or it will cause the problems you describe.

http://www.thisoldtractor.com/gtbend...ltage_test.pdf

If you type (testing pertronix module) in the google search box it will show the page I posted as well as some more to help.

12-30-2010, 09:32 PM	#1
BAGNDRAGIT Just Not Low Enough! Join Date: Mar 2009 Location: Phoenix, AZ Posts: 525	electronic iginition ???'s ok in my quest to get my truck running again i have found that my spark is inconsistent. during cranking there is no spark. but after i stop cranking it discharges (mind you this is straight out of the coil) i have an electronic ignition conversion. the black wire is to the coil neg and the red is to the coil pos. and i just replaced the coil. so im thinking the module is bad. there is no resistance between the two module wires. is that normal. if someone has one they could test i would really appreciate it. oh btw its a 71 250 inline. __________________ NEED ELECTRICAL HELP? ASK ME! 67-72 Full Wiring Diagrams Lots Of Info, TAKE A LOOK 1967 Chevy C-10 Shortbox Bagged 327 4spd Previous: 1971 Chevy C-10 Short Sep I6 Auto (Traded) 1973 Chevy C-20 THE REDNECK BATTLE TRUCK 2001 Chevy Silverado 2Dr 5.3L Shortbox. R.I.P. 1969 Volkswagen Bug This is my first meeting, I have a horsepower problem.

12-31-2010, 12:01 AM	#2
BAGNDRAGIT Just Not Low Enough! Join Date: Mar 2009 Location: Phoenix, AZ Posts: 525	Re: electronic iginition ???'s ttt anyone? __________________ NEED ELECTRICAL HELP? ASK ME! 67-72 Full Wiring Diagrams Lots Of Info, TAKE A LOOK 1967 Chevy C-10 Shortbox Bagged 327 4spd Previous: 1971 Chevy C-10 Short Sep I6 Auto (Traded) 1973 Chevy C-20 THE REDNECK BATTLE TRUCK 2001 Chevy Silverado 2Dr 5.3L Shortbox. R.I.P. 1969 Volkswagen Bug This is my first meeting, I have a horsepower problem.

12-31-2010, 12:40 AM	#3
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: electronic iginition ???'s How are you powering the ignition and is it a regular HEI or a pertronix setup. If you used the original resistance wire for the points coil it will not provide enough voltage to an electronic ignition to saturate the coil and get a strong spark. the yellow wire from the starter has 12 volts on it which should provide spark for starting if it is still wired into the system, but after the starter disengages the normal running voltage is 9 for a points ignition. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

12-31-2010, 01:38 PM	#4
BAGNDRAGIT Just Not Low Enough! Join Date: Mar 2009 Location: Phoenix, AZ Posts: 525	Re: electronic iginition ???'s i have run 12v to the coil and the pertronix unit. and still have the same problem. does anyone have a pertronics unit they can test the resistance on? or tell me how to tell if they are bad? __________________ NEED ELECTRICAL HELP? ASK ME! 67-72 Full Wiring Diagrams Lots Of Info, TAKE A LOOK 1967 Chevy C-10 Shortbox Bagged 327 4spd Previous: 1971 Chevy C-10 Short Sep I6 Auto (Traded) 1973 Chevy C-20 THE REDNECK BATTLE TRUCK 2001 Chevy Silverado 2Dr 5.3L Shortbox. R.I.P. 1969 Volkswagen Bug This is my first meeting, I have a horsepower problem.

12-31-2010, 03:52 PM	#5
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: electronic iginition ???'s Here is a google page on testing the module and the coil. If you are running the original coil you will need the resistance but if you are running the pertronix coil then 12 volts should be Ok. Another thing to figure is the gap between the module and the pickup. Make sure it is correct or it will cause the problems you describe. http://www.thisoldtractor.com/gtbend...ltage_test.pdf If you type (testing pertronix module) in the google search box it will show the page I posted as well as some more to help. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. Last edited by VetteVet; 12-31-2010 at 03:53 PM.



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