I had a few of those coils burned out on my 85 gl. They actually are wired in series with taps in between. For low speed all three are used, next speed bypasses one and only uses 2 of the resistors etc. until high speed where they are all bypassed. I have a lot of coiled nichrome wire and cut some small pieces that I soldered in place. It's almost impossible to solder the wire because the nichrome repels instead of wetting the solder. I might try to plate the wire with copper if I get time. Then I could cut little coils and plate the ends and make them available.