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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

47Fordor

07-18-2010 @ 5:42 AM

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When it comes to stuff like resistors, I believe "when in doubt, replace it." I don't believe you would get any bonus points in judging for having an original resistor, they're not that expensive, and you probably just saved yourself a coil (which is a good bit more expensive).

Chris

louganser

07-17-2010 @ 2:33 PM

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Thanks for all the tips! I found a NORS resistor at a old time parts shop in my town. When I removed the old one, I found that the ceramic rod was cracked. After installation, I had approx. 3.5 volts.

Lou G

supereal

07-09-2010 @ 9:55 AM

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The voltage reading of the resistor, and any other part of the system, is load dependent, as voltage is the product of current times resistance. That is why the input to the coil reads the same as the battery when the points are open and the coil isn't drawing power.

39 Ken

07-08-2010 @ 6:21 PM

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OldFord2 mentioned it but here it is again. The resistor is supposed to be at a full 6V when cold. Start the engine and let it run. Check the voltage again. As the resistor warms up, the voltage will drop to around 3.5 v. Ken

louganser

07-08-2010 @ 3:21 PM

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Thanks! I looked thru several catalogs and found it under the dash. I tested it with a meter and it registered a full 6 volts. I've ordered a new one.

Lou G

supereal

07-08-2010 @ 9:40 AM

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Right, Ken. I left out the important "inside of" on my post. A weak point on both original and repro ballast resistors are the end terminals that connect to the nichrome element. The constant heating and cooling of that winding will often cause the crimped connections to loosen. They need to be solidly crimped, and soldering them is recommended. A very small added resistance will lower the voltage to the coil by enough to prevent easy starting and poor operation under load.

Steve's 48 Ford

07-08-2010 @ 8:44 AM

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My 48 has the resistor is mounted on top of coil.
Joe's Antique Ford parts in Uxbridge, MA has them 1-800-508-3980. Part Number 18-12250 for $6.00 Good Luck

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.

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

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

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