The Ford Barn

Bellinis Custom · 04-30-2018, 04:51 PM

I have a Model A with no spark, it had one of those Electric ignition that took a crap. now i wired and installed all OEM parts with an origanal Diagram. but still no spark, im stumped and confused. iv checked everything over and over.

1955cj5 · 04-30-2018, 05:12 PM

Two of the many places that can give trouble.

The lower plate wire can short out. There is an article here:

http://www.fordgarage.com/pages/adistlowerplate.htm

If you screw #13 from the pictured diagram in too far, it can short out also...just a couple turns is all that's needed.

For what it's worth, it turned out my ignition switch was bad...

You just need to go step by step, number by number through the pictured diagram and check for power with a test light or a voltmeter.

.

Will N · 04-30-2018, 05:12 PM

You have to be systematic to find where the fault is. You have the wiring diagram, so get a test light or multimeter, and start from the source and work your way forward, testing for voltage at each spot where a wire is connected somewhere.

Do you have a fuse somewhere in your wiring? Did you check if the fuse is intact?

rocket1 · 05-01-2018, 07:43 AM

I would think the electronic ign. is still good as you found out unfortunately you have the same problem,no spark at the points?you got to trace it down per the schematic.

eagle · 05-01-2018, 09:08 AM

I would use a good quality DVM instead of a test light. With a DVM you can see voltage losses. First thing to check is in reference to chassis gnd, one side of coil should be battery voltage and the second should switch from battery to 0v as you slowly crank the motor over. If the vlotage just drops a couple volts and does not go right to ground when the points close, you have dirty/bad points. I would say dirty points is the most common No Spark cause.

redmodelt · 05-01-2018, 10:49 AM

Sponsored Links (Register now to hide all advertisements)

I would say dirty points is the most common No Spark cause. 2x that. Even a little film on the points will prevent firing. Try pulling a piece of card stock or such thru them and check again.

Mike V. Florida · 05-01-2018, 02:52 PM

https://www.fordbarn.com/forum/showp...87&postcount=4

Bellinis Custom · 05-02-2018, 02:01 PM

Ok so i went threw everything and have 4.1Volts and the points? why would that be so low

DJ S · 05-02-2018, 02:14 PM

Quote:

Originally Posted by Bellinis Custom

Ok so i went threw everything and have 4.1Volts and the points? why would that be so low

Loose or corroded connections... work backwards and locate where the voltage drop occurs.

Bellinis Custom · 05-02-2018, 02:17 PM

Ok so on negitive side of coil with key off or points open only reading 3.7 volts. Bad coil??

Jacksonlll · 05-02-2018, 03:05 PM

Take off the wire on the neg side and see if you get 6 volts. If you do, the prob is down stream of the coil.

Bellinis Custom · 05-02-2018, 03:14 PM

So i guess the new coil i got from napa was fualty. threw a new one on she fired rigfht up thanks for the help

Mike V. Florida · 05-03-2018, 11:49 AM

Quote:

Originally Posted by Bellinis Custom

Ok so i went threw everything and have 4.1Volts and the points? why would that be so low

On the drawing what do you have at point 11?

04-30-2018, 05:12 PM	#3
Will N Senior Member Join Date: Jul 2010 Location: Pennsylvania Posts: 1,101	Re: No Spark You have to be systematic to find where the fault is. You have the wiring diagram, so get a test light or multimeter, and start from the source and work your way forward, testing for voltage at each spot where a wire is connected somewhere. Do you have a fuse somewhere in your wiring? Did you check if the fuse is intact?

05-01-2018, 07:43 AM	#4
rocket1 Senior Member Join Date: Mar 2014 Location: Midland Park,N.J. Posts: 1,108	Re: No Spark I would think the electronic ign. is still good as you found out unfortunately you have the same problem,no spark at the points?you got to trace it down per the schematic.

05-01-2018, 09:08 AM	#5
eagle Senior Member Join Date: Aug 2011 Location: Eagle Bend, MN Posts: 2,025	Re: No Spark I would use a good quality DVM instead of a test light. With a DVM you can see voltage losses. First thing to check is in reference to chassis gnd, one side of coil should be battery voltage and the second should switch from battery to 0v as you slowly crank the motor over. If the vlotage just drops a couple volts and does not go right to ground when the points close, you have dirty/bad points. I would say dirty points is the most common No Spark cause. __________________ "There are some that can destroy an anvil with a teaspoon and shouldn't be allowed to touch anything resembling a tool."

05-01-2018, 10:49 AM	#6
redmodelt Senior Member Join Date: May 2010 Location: Portland OR Posts: 6,340	Re: No Spark Sponsored Links (Register now to hide all advertisements) I would say dirty points is the most common No Spark cause. 2x that. Even a little film on the points will prevent firing. Try pulling a piece of card stock or such thru them and check again. __________________ I know the voices aren't real but damn they have some good ideas!

05-01-2018, 02:52 PM	#7
Mike V. Florida Senior Member Join Date: May 2010 Location: South Florida Posts: 14,054	Re: No Spark https://www.fordbarn.com/forum/showp...87&postcount=4 __________________ What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II

04-30-2018, 04:51 PM	#1
Bellinis Custom Junior Member Join Date: Apr 2018 Posts: 5	No Spark I have a Model A with no spark, it had one of those Electric ignition that took a crap. now i wired and installed all OEM parts with an origanal Diagram. but still no spark, im stumped and confused. iv checked everything over and over.

05-02-2018, 02:01 PM	#8
Bellinis Custom Junior Member Join Date: Apr 2018 Posts: 5	Re: No Spark Ok so i went threw everything and have 4.1Volts and the points? why would that be so low

05-02-2018, 02:17 PM	#10
Bellinis Custom Junior Member Join Date: Apr 2018 Posts: 5	Re: No Spark Ok so on negitive side of coil with key off or points open only reading 3.7 volts. Bad coil??

05-02-2018, 03:05 PM	#11
Jacksonlll Senior Member Join Date: Jul 2012 Location: Michigan-- Member of Oakleaf of MARC Posts: 1,686	Re: No Spark Take off the wire on the neg side and see if you get 6 volts. If you do, the prob is down stream of the coil.

05-02-2018, 03:14 PM	#12
Bellinis Custom Junior Member Join Date: Apr 2018 Posts: 5	Re: No Spark So i guess the new coil i got from napa was fualty. threw a new one on she fired rigfht up thanks for the help

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode