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EFV-8 Club Forum / General Ford Discussion / 1948 Ford V8 coil

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Discussion Topic: 1948 Ford V8 coil -- page: 1 2

louganser

07-06-2010 @ 5:38 PM

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I just received a new coil to replace the defective one. Are there any specific steps to be followed when replacing the coil (other than disconnecting the two wires and the lead wire) and installing the new unit?

Lou G

37RAGTOPMAN

07-06-2010 @ 5:53 PM

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Just check to make sure the coil is receiving the correct amount of voltage. I think about 3 1/2 to 4 volts,it should have a resister to lower the voltage, if not that is why the old coil is defective and not good anymore, The resister should be under the dash on the firewall.
37RAGTOPMAN KEEP ON TRUCKIN,,,,!!!!!!!!

deluxe40

07-06-2010 @ 7:43 PM

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The '46-'48 book notes on page 5-11 that the ballast resistor was "relocated to a fiber board device that mounted over the coil top terminals". This was done on the V8 cars at the time that the H-series six cylinder engine was introduced in 1947. Consequently, there should be a ballast resistor mounted on top of the coil in '48. If it isn't there, you might have found the reason the coil failed.

supereal

07-07-2010 @ 10:10 AM

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My '47 was made in late August of that year, and still had the ballast resistor on the firewall. Most 48's had them on the input terminal of the coil. The resistor is important as a sort of voltage regulator that prevents overheating the coil, as well as protecting the points. Just be sure that your new coil doesn't have a built in resistor, as we have seen one of those in an aftermarket repro.

oldford2

07-07-2010 @ 2:20 PM

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If you check the voltage with just the ignition on you may get 6 volts. Start the engine so the resistor can warm up and do it's job - reduce voltage to 3 1/2 to 4 volts. This allows 6 volts to the coil for starting and then cuts back to 3-4 volts for running so the points don't burn too soon. Properly maintained, this is the best ignition system for these flatheads.
John

louganser

07-07-2010 @ 2:49 PM

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There was nothing mounted on the top of the coil. What does a rsistor look like? Is it tubular, approx. 1.5 inches long with a wire?

Lou G

supereal

07-07-2010 @ 3:03 PM

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It is mounted on the firewall. It is a tubular unit with a slotted metal cover. You can see a picture on page 150 of the C&G online catalog. www.cgfordparts.com
Sometimes it will be mounted on the same board as the headlight circuit breaker, also shown on that page.

39 Ken

07-08-2010 @ 5:20 AM

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Bob, To clarify, "mounted on the firewall"; means that it's mounted on the inside of the firewall, under the dash, like the cars thru '47. Ken

TomO

07-08-2010 @ 7:11 AM

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If you have the trumpet horns mounted on the left inner fender, your resistor will be mounted on the inner side of the firewall and will have a red / black wire connected to one side. With the sea sh*ll horns, the resistor is mounted on the coil. The 48 Ford should have the sea sh*ll horns.

Tom

48Tudor

07-08-2010 @ 7:28 AM

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The resistor will have TWO connections on it. If you see something metalic, tubular, with one wire coming from the end, that will be a condenser. Normally mounted on the Dist., but could have been put on the coil.

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