12 volt coil

Coils that say '12v but require an external resistor' are in fact, 6 volt coil relabeled. It's cheaper for the parts places to keep churning out the same 6v coil and re-label it for different uses than to tool up for an actual 12 v coil (different windings, wire guages I would assume)

When I convert a vehicle over to 12v, I use an E40 group (E40, or E40Z) coil as a direct replacement. Looks pretty stock, and they are native 12 v (12v in/12v out) and require no external resistor block to drop the voltage to 6v.

If you put 12v to one side of a coil that says you need an external resistor, you will see 6v on the opposite side of it. Coils do not last too long doing this (year or so), but can work in a pinch.. I keep a 6v coil as a spare in case I or a 6v companion vehicle needs a spare to limp home with.

I Have ran te e40's for 4 years so far and no issues, and not having the resistor as firewall clutter or another failure point is a big bonus :)

- Dabe
 
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