1979 GMC Other

Electrical problem
1979 Other GMC Models 4 cyl

Why is a resistor needed or not needed on an ignition system?
Dan C
November 12, 2008.

If you have a points type system and some electronic ignitions if you don't have a resistor to cut the voltage down from 12 down to about 9 it will burn the points right up and damage some of the electronics in the electronic system. Not all electronic systems need resistors though.

Oct 10, 2009.