1980 Bronco, stock DS2 ignition. Converting to a 1991 460 with EEC-IV fuel injection. Currently sourcing a RUN & START power source for the 460’s ignition.

Preferred plan was to use the R/LG wire currently feeding the DS2 as the power supply. I was hoping to source this power by cutting out the resistor and re-splicing since my ‘91 EVTM shows no resistor. I found the resistor but it’s more like a fusible link and runs from within the engine bay all the way under the dash. So getting around it is going to be difficult.

Looking at my EVTM, I was thinking of tying the W/LB wire to the BR/PK and sourcing that as the power replacement. I have access to both wires in the engine bay. Any concerns with this approach?

And for anyone who’s done the conversion before, is the 1.1 ohm resistor on the R/LG circuit prohibitive for EEC-IV ignition?

Thanks!

 

The 1.1 Ohm ballast resistor is not required for the ignition system used on the EFI trucks. The coil is designed to run with the full 12 VDC all the time. By keeping the ballast resistor in circuit you will be reducing the voltage the newer coil is designed to use when the key is in the Run position. Lower voltage equals reduced spark intensity.

 

Agreed. Any concern with splicing the two wires I noted to create a power source in both Run and Start? The W/LB is about the same gauge and I believe it is protected by a 20 gauge fusible link, which, according to my 1991 van EVTM, is also protecting all the ignition equipment fed by the R/LG wire.

The resistor won’t be easy to bypass and I don’t want to pull the wiring harness from underneath the dash unless absolutely necessary.

 

Splicing those together should work.