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Which coil

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Author  [Modern View]

08-12-2017 18:26:20

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I'm putting in a tune up kit in a '45 BN. I'm trying to figure out what type of coil to buy? It is a 12 volt with delco distributor. Currently there is an external resistor on the coil. I was shopping at Tractor Supply tonight and they had a coil that said it worked for both 6 volt and 12 volt, but the coil itself has no external resistor required written on it. So I got kind of confused. Part number is 396546R93.

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08-13-2017 09:49:38

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 Re: Which coil in reply to jeffred, 08-12-2017 18:26:20  
From TSC's website....

-For 6 volt systems with or without external resistance
-For 12 volt systems with external resistance

Clear as MUD, eh? NOT really!

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08-12-2017 19:57:21

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 Re: Which coil in reply to jeffred, 08-12-2017 18:26:20  
Old is correct. No such thing as described. It might be labeled as such. A 6 volt coil will be about 2 to 2.5 ohms. So will a 12v coil for use with a ballast resistor (these two are essentially the same) A 12v coil for use with no resistor is truely a 12v coil. Jim

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08-12-2017 19:33:10

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 Re: Which coil in reply to jeffred, 08-12-2017 18:26:20  
Well #1 you big problem is you where looking at China made junk so yep they tend to put info on things like coils that are not correct. No way a coil can work on 6 volts and 12 volts with out either not running well on 6 volts or running well but burning up points fast. Buy ignition stuff for places like NAPA or O'Reilly's and get good brand parts. Shoot I buy points for some of my stuff and it has a life time warranty on them so when they go bad I take them back and get new for nothing

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Loren in Iowa

08-13-2017 07:30:10

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 Re: Which coil in reply to old, 08-12-2017 19:33:10  
I bought one of those "no resistor needed" coils, at NAPA, and have been using it on a Delco distributor, with a 12 volt system, and it has worked fine, for the last several years.

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08-13-2017 08:31:05

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 Re: Which coil in reply to Loren in Iowa, 08-13-2017 07:30:10  
IC14SB is NAPA number for 12 volt "no resistor needed" coil. It should have 3 ohms across + and - terminals. I would use it (or equivalent), get rid of the resistor and eliminate a future problem.

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08-13-2017 09:24:34

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 Re: Which coil in reply to rvirgil_KS, 08-13-2017 08:31:05  
3 ohms yes but how many people have a VOM that is calibrated so as to get that reading out of say 10 different VOMs ?? I have 2 VOMs and I know if I test things with the 2 of them I get a different reading out of each so one can only get a ball park figure out of many cheap meters

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08-13-2017 15:55:27

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 Re: Which coil in reply to old, 08-13-2017 09:24:34  
True. Especially with cheap meters. On a coil resistance check I use a digital meter that will hopefully tell me if reading is closer to 1 1/2 ohms or 3 ohms.

I find a lot of the erratic readings at low ohms are in the probes and probe connections. I short the probes, note the reading, then check across coil and subtract probe resistance. Sometimes takes a few tries to reach a conclusion.

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08-13-2017 07:39:28

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 Re: Which coil in reply to Loren in Iowa, 08-13-2017 07:30:10  
If you disconnect the lead to the points, what is the resistance across the two small coil terminals. old and I are trying to figure out how a coil can be acceptable for use with or without a ballast resistor and be either too hard on points, or too weak on spark. Jim

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08-12-2017 18:34:48

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 Re: Which coil in reply to jeffred, 08-12-2017 18:26:20  
Personally I try to put back what is on it....but you can go either way; internal or external. Not sure about the 6/12v both in one....these guys will know.

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