Join Date: Mar 2002
Location: Austin, TX, USA
Re: Ballast Resistor, needed or not?
I have been running my Unilite without an added resistor for 10 years. Doesn't the original wiring have a resistor already? Or am I just lucky too?
The OEM harness did use a resistor wire. If that is the case, then no ballast resistor is needed. BUT notice that the ballast resistor only feeds the coil. The distributor needs a full 12V if schematic provided by SixtyAte is correct.
If you do have a resistor wire, it will be cloth covered and stiffer than the usual copper wires in the harness. Often the insullation will be cracked due to the head disappated by the wire. Also, the conductors will have a silver appearance - not bright copper (or tarnished copper) like the other wires in the harness.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI