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12v coil on 6 volt system
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Scott B View Drop Down
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Joined: 14 Sep 2013
Location: Kansas City
Points: 1051 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Scott B Quote  Post ReplyReply Direct Link To This Post Topic: 12v coil on 6 volt system
    Posted: 12 May 2016 at 7:17pm
Can I put a 12 volt coil on a 6 volt system without any concerns?
THink my current 6v coil needs to go back to china, planning on doing a full conversion in a couple of months so wanting a to short term fix with a 12v coil.
Thoughts?
D17 Series 1
Allis B- 1939
Allis B- 1945
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DougS View Drop Down
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Joined: 03 Nov 2011
Location: Iowa
Points: 2490 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DougS Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2016 at 8:28pm
It *might* work. You'll have a weaker spark. I wouldn't recommend it. If it doesn't work you'll still have to buy another coil. Extra $$$. I'd recommend that you buy a 6 volt coil now and add a ballast resistor when you convert to 12 volts.
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Gerald J. View Drop Down
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerald J. Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2016 at 9:06pm
A 12 volt coil designed to work with an external resistor should work good on 6 volts but a coil wound for 12 volts or with an internal resistor for 12 volts will give a weak spark on 6 volts. It will depend on the coil details that we have no way of knowing of how bad the spark is at 6 volts, especially when the battery is pulled down while the starter is cranking and may be less than 6 volts.

Gerald J.
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