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05-27-2019, 07:26 AM | #1 |
Senior Member
Join Date: Oct 2014
Location: capecod
Posts: 123
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39 ford flathead
my car starts when it is cold but when it gets hot and I go to start it will not could some one please tell me how to test a coil 6 volt with a multimeter and what should the reading be thank you tom
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05-27-2019, 07:57 AM | #2 |
Senior Member
Join Date: Oct 2016
Location: harpursville ny
Posts: 1,038
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Re: 39 ford flathead
Is it turning over normally when hot? If it is first pull a plug wire and see if you have spark. If you do that will elimate an electrical problem.
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05-27-2019, 08:05 AM | #3 |
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Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: 39 ford flathead
Both coils and condensers can act up when hot. Both are difficult to check with out the proper equipment. It would probably be easier to just have the coil rebuilt (if original style) or replace it if it is a "can" coil. Same with the condenser, to me it would just be easier to replace it. It's less likely, but it could also be related to the ballast resistor. You could check that by bypassing the resistor for a short period of time.
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05-27-2019, 08:10 AM | #4 |
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Join Date: Oct 2014
Location: capecod
Posts: 123
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Re: 39 ford flathead
I did what you suggested and the car started right up I could see the spark jumping from the plug wire,but if I run it for awhile and then go to start it,it will not start could it be the coil thank you
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05-27-2019, 08:20 AM | #5 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: 39 ford flathead
Yes, it could be the coil or the condenser, this is a fairly common problem.
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05-27-2019, 11:31 AM | #6 |
Senior Member
Join Date: May 2010
Location: Florida and Penna.
Posts: 4,471
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Re: 39 ford flathead
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starting. The amp load of the starter pulls the voltage to the coil way down. Some times it will start when the engine is still turning just as the start button is released. ALL old Ford coils are bad when the get hot. Condensers can also act bad when hot. The sure way to solve the problem is to send your coil to to Skip in Florida to have it rebuilt with modern high temp materials. Also send a few condensers so Skip can heat them up to make sure they work hot. Contact [email protected] for info. G.M.
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