Searching for 12v switched power after ditching ballast and installing aftermarket electronic ignition

[Mattax]

Working with wiring diagrams. November 1974 MTSC

Browse MTSC by Model Year – 1974 – MyMopar

mymopar.com

 

[mshred]

That J3 14 BR ,suggest you test that connection for back feed. From blow up of relay inside wiring appears to not be connected to any thing else. To be sure put 12 volts on J3 and then see if voltage shows up on other relay connections

So if that connection on the relay is not connected to anything else (confirmed with testing as mentioned) then I can connect that J3 Brown wire to the J2 blue wire, and get my ignition in RUN and START with no backfeed?

 

[Bugman]

Found this post 2 of this thread Lean Burn Conversion 101

 

[Bugman]

concerns back feed

 

[Bugman]

blow up

 

[67Dart273]

So if that connection on the relay is not connected to anything else (confirmed with testing as mentioned) then I can connect that J3 Brown wire to the J2 blue wire, and get my ignition in RUN and START with no backfeed?

You can easily test for it. If you can not prove it is not happening, do one of what I posted in the bottom of post 25.

The simple answer is this: Either your newer car has an isolated bypass contact or not. (the old IGN2) If not, then backfeed is gonna be a problem. If that is so, then you need either a diode or a relay to resolve.