To answer your question you need to know that they make several differant types of coils. If you have a 12v coil that has the resistor built into the coil can from extra wire windings then NO you do not need a external resistor. But on the other hand if your coil does not have a built in resistor then you have to have a external resistor in the wire going to the coil in a 12v system.
Look at your coil. See if you can still read the writing on the side of the can. It should say if a resistor is needed or not. May say one of the following........ 12v no external resistor required 12v external resistor required
As mentioned by another poster NAPA sells a 12v coil that can be wired straight to 12v's. The resistor is built into the can. Local store sells them for $16.99. For this amount of money I would just buy it for the piece of mind of knowing I have the correct part installed.
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