Rgie, the Napa internal resistor coil #IC14 is the only way to go. I use them on old tractors that have been converted to 12v. Think the last one I got from my local Napa was twenty something bucks.
57 GMC LCF 370 55 John Deere 40-W 59 John Deere 430-W 2000 GMC 4x4 56 John Deere 420-W Pix on Photobucket