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fsacht
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-- 09-08-2015 @ 3:50 PM
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I've got a '42 Merc and want to use a modern cylinder type 6 volt coil. Must I bypass or remove the resistor that is in line with the negative lead to the conventional stock coil? Or, does it matter? How can I tell if the new style coil has resistor built in?
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40 Coupe
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-- 09-09-2015 @ 4:57 AM
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You can measure the resistance of the coil primary winding if it is very close to 1.0 Ohms you can bypass the resistor. If it is closer to 0.5 Ohm you will need the Ford resistor. Why not have the original Ford coil rebuilt? No modifications needed, neat, simple installation.
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cliftford
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-- 09-09-2015 @ 5:03 AM
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I wasn't aware that there is a 6v coil with internal resistance available. I would use a standard coil with your existing resistor. The supplier you get it from should be able to tell you which type it is.
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fsacht
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-- 09-09-2015 @ 6:31 AM
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I'm running now with the original coil rebuilt by Skip Haney and it is fine. If it fails the new type is easy to find and a convenient backup,provided you have a suitable mounting bracket. I searched the site forum for infomation plus the roster for an article in a past issue of v8 Time but didn't spot one. Just looking for advice from the experts. Thank you all.
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flathead48
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-- 09-09-2015 @ 6:19 PM
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I used a 49 round coil on my 48 before I had skip rebuild my original. It has a internal resister so you have to by pass your external one. I actually used it for 15 years, now I carry it for a spare.
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