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THIOKOL/LMC/DMC Technical Issues Forum Technical repair issues & questions for Thiokol/DMC/LMC

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Old 11-19-2014, 02:39 PM
Sylvia Tunaskas Sylvia Tunaskas is offline
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Default Ballast resistor - 86 LMC 1200

I am having difficulty locating the proper application for my cat. I have found many types and resistence. (spade connections, bolts to adapt spade, and screw terminals - also resistence from .5 to 1.9 ohms) I have been told I need to read the ohms from a meter to pinpoint the exact resistence. The cat is at the Cabin and I am 60 miles away.

It has an electronic ignition (no points) I cannot locate an ignition module so am not sure if it is Duraspark. I will try and attach a picture of it in the cat. Research has given me many opinions and the servive manual gives me a Ford numbers (N-25-1 :B8A-12250 A :FEU-12250 C) When cross referenced at most part stores I get an array of choices from .5 to 1.9 ohms and connection types.

I have found a variable resistence (.75 cold and 1.5 warm) from Mallory (#700)

http://mallory-ignition.com/points-b...-resistor.html

Any help would be appreciated to find the correct application. I replaced the coil (std-fd-471t) but the RU-4 resistor they gave me was not correct according to the mechanic so we did not replace the current one.

Any help would be appreciated. (it is a Ford 300 IL 6) Thanks.
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Old 11-20-2014, 01:31 PM
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Default Re: Ballast resistor - 86 LMC 1200

that looks like the old duraspark 1 system jeep also used this same for some of their products.
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Old 11-29-2014, 06:29 PM
Sylvia Tunaskas Sylvia Tunaskas is offline
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Default Re: Ballast resistor - 86 LMC 1200

In case anyone is interested, here is what I found when I went up and put a meter on the coil and ballast resistor. Ballast resistor 1.6 ohms. Old coil (std-471) 1.5 ohms. New coil (std-471T)
1.3 - 1.4 ohms. Electronic Ignition is Pertronix.

http://www.pertronix.com/prod/ig/ignitor/default.aspx

I am leaning towards a Flamethrower, epoxy filled (as opposed to oil filled), 1.5 ohm internal resistance coil and a 1.6 ohm external ballast resistor from Jegs.

http://www.jegs.com/i/Pertronix/751/40111/10002/-1
http://www.jegs.com/i/JEGS-Performan...40102/10002/-1

Any input would be appreciated. Pictures of distributor / Pertronix Ignitor attached.
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Old 11-29-2014, 11:35 PM
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Default Re: Ballast resistor - 86 LMC 1200

if it were me I would change to a dura spark 3 system with the high output coil 8 mm wires and huge cap one thing I can say is I never seen an hei ford cap ever have a problem even when sprayed with water. and parts are easy to acquire at the local auto parts store
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Old 11-30-2014, 03:10 PM
Sylvia Tunaskas Sylvia Tunaskas is offline
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Default Re: Ballast resistor - 86 LMC 1200

Thanks. If the new parts above do not put an end to my "issues" it may be the best way to go.
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Old 12-13-2014, 08:50 PM
Sylvia Tunaskas Sylvia Tunaskas is offline
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Default Re: Ballast resistor - 86 LMC 1200

In case anyone is interested. I spoke with a tech at Pertronix and he identified my electonic ignition module as a Pertronix Ignitor #1262. He also sent information on how to check the components of the system as well as specs for it's operation.


I found it an interesting read.
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