The Ford Barn

36 ford · 09-19-2015, 07:42 AM

Hello friends,

My 39' with a 59A is now equipped with a nice crab from Bubba, (Thank you Bubba for the high speed service), Moroso wires and recommended coil Pertronix 40511 3.0 ohm. It cranks well but just won't "catch" runs for about 3 seconds and quits. I noticed that the coil gets a bit warm while cranking.
The motor ran well before with a helmet type and MSD electronic ignition and a mallory coil but the wiring was a nightmare so the change to a crab seemed like the way to go. I have fuel and spark and a fresh Bubba Crab so where do I go from here? Is it normal for the coil to heat up while cranking? It's a 12 volt system.

Phil

SofaKing · 09-19-2015, 08:25 AM

6v or 12 volt?

36 ford · 09-19-2015, 08:26 AM

Quote:

Originally Posted by SofaKing

6v or 12 volt?

12 volt

36 ford · 09-19-2015, 10:06 AM

Problem solved.....positive and negative wires to the coil were switched.
Thanks Bob Brust for the help! What a wonderful friend he is!

Phil

BUBBAS IGNITION · 09-19-2015, 02:53 PM

Just a info note on this :

if a coil has ran in a specific polarity for any length of time the coil residual magnetism
is set permentantly in the coil....
If ran the other way it will fire but looses approx 85% of the output....

36 ford · 09-19-2015, 04:31 PM

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Interesting bit of info, Jim.....I did crank it a number of times and run time was maybe 2-3 seconds. Should I be looking for another coil? How does one check coil output to determine condition?

BUBBAS IGNITION · 09-19-2015, 06:14 PM

Quote:

Originally Posted by 36 ford

Interesting bit of info, Jim.....I did crank it a number of times and run time was maybe 2-3 seconds. Should I be looking for another coil? How does one check coil output to determine condition?

Yep replace the coil........

09-19-2015, 07:42 AM	#1
36 ford Senior Member Join Date: Jul 2010 Location: Chambersburg, Pennsylvania Posts: 311	My 39 won't start Hello friends, My 39' with a 59A is now equipped with a nice crab from Bubba, (Thank you Bubba for the high speed service), Moroso wires and recommended coil Pertronix 40511 3.0 ohm. It cranks well but just won't "catch" runs for about 3 seconds and quits. I noticed that the coil gets a bit warm while cranking. The motor ran well before with a helmet type and MSD electronic ignition and a mallory coil but the wiring was a nightmare so the change to a crab seemed like the way to go. I have fuel and spark and a fresh Bubba Crab so where do I go from here? Is it normal for the coil to heat up while cranking? It's a 12 volt system. Phil Last edited by 36 ford; 09-19-2015 at 08:26 AM.

09-19-2015, 08:25 AM	#2
SofaKing Senior Member Join Date: Jun 2014 Location: Salt Lake City, Utah Posts: 756	Re: My 39 won't start 6v or 12 volt?

09-19-2015, 10:06 AM	#4
36 ford Senior Member Join Date: Jul 2010 Location: Chambersburg, Pennsylvania Posts: 311	Re: My 39 won't start Problem solved.....positive and negative wires to the coil were switched. Thanks Bob Brust for the help! What a wonderful friend he is! Phil

09-19-2015, 02:53 PM	#5
BUBBAS IGNITION Senior Member Join Date: May 2010 Location: SPEEDWAY INDIANA Posts: 4,148	Re: My 39 won't start Just a info note on this : if a coil has ran in a specific polarity for any length of time the coil residual magnetism is set permentantly in the coil.... If ran the other way it will fire but looses approx 85% of the output.... __________________ If it Makes Spark, we do it !!!! www.bubbasignition.com [email protected]

09-19-2015, 04:31 PM	#6
36 ford Senior Member Join Date: Jul 2010 Location: Chambersburg, Pennsylvania Posts: 311	Re: My 39 won't start Sponsored Links (Register now to hide all advertisements) Interesting bit of info, Jim.....I did crank it a number of times and run time was maybe 2-3 seconds. Should I be looking for another coil? How does one check coil output to determine condition?