engine harness swap?

[charger72]

I was wondering if I could use a electronic wiring harness from a early 70's pickup(73-74) onto my 72 charger to get rid of the points ignition? They look to be about the same connectors. By the way, the car is a non ralley dash harness.

[Chryco Psycho]

actually the Ecu is easy to wire in , you just need to hook 12v  [generally dark blue in you rexisting harness ]up to the Blue / yellow wire to the ECU , use the Black / yellow wire to negative coil & swap the dist & plug it in & set the timing

[bohog]

You can also purchase the ECU harness itself from Mopar Perf. I think it's about $15.00

[charger72]

So, what your saying is swap the blu wire and hooh it up the the blue and yellow wire on the ECU and then the black and yellow wire to the - side of the coil? What about the bigger ballast resistor?

[Nacho-RT74]

if you use the 4 pins ECU module, don't need the double ballast resistor, single will be fine.

Doble ballast resistor is for 5 pins module, what is extra feeded by that extra source from ballast

[charger72]

this may sound stupid, but all I can ever find is the 5 pin setups. What are the 4 pins usually on?

[1970440RT]

I am pretty sure all the new ecu's are 4 pin.  If you are scrounging a junkyard, try to find one in the newest models that still used them.  The ECU's you order from Mopar are 4 pins.

[Chryco Psycho]

THE PLUG IS aLWAYS A 5 PIN , THE PINS IN THE ecu USUALLY HAVE 1 MISSING, I hate caps lock 
any ecu after 76 has only 4 pins as do all of the performance boxes

[Nacho-RT74]

right... sorry if there was some missunderstood, the plug is allways 5 pins, is the Module itself what changed from 5 to 4 pins... but both ( plug and module ) are intrechangeable if you use the right ballast setup... 5 pins with double ballast resistor and 4 pins with single ballas resistor.

Well, in fact, you can use the double ballast with 4 pins module, is just only the secondary resistance won't be on use.

[TruckDriver]

If I would buy a engine harness that already is a electronic ignition set up, would that simply plug into the the fire wall or what I have to do to make it work? I'm talking one already out of a '72 Charger. And would '73 & '74 harnesses be different from '72 harnesses?

[Nacho-RT74]

74 is different for the reset button to the interlock

[Chryco Psycho]

it is easy to do without swapping the harness , it is a 2 wire hook up
you have a dark blue to the ballast & voltage regulator , tie in the blue /yellow trace wire into this
then hook the Black / yeelow trace wire onto the - coil terminal & remove the exiosting wires to  the - coil & swap the dist & plug it in

[Nacho-RT74]

what Neil said

[charger01]

can I use the 4 prong ballast resistor with a 4 pin mp ecu?   I purchased a modified harness from year one for a 69 charger.   it is set up to have a blue and a brown on the left bottom tab of the ballast resistor,     green wire above that(gets cut),,,,,,,,,,and a blue wire on each of the tabs on the rihgt hand side of the resistor.   following this? sound right?

[Chryco Psycho]

it sounds right But there is no need to wire the second 1/2 of the 4 prong resister , just wire the blue & brown , the green blue does nothing with a 4 pin ECU

[charger72]

I got mine done. Found a 5 pin harness from a 73 in the shed. it is easy to swap harness' just plugs into the same spot. I would have cut the wires like Niel said, but I found the harness.

[andy74]

its as easy as chryco said,i did mine in an hour and a half,and that was cause i drank 2 beers while i was under the hood

[Chryco Psycho]

I did one in Ardmore in 6 minutes ...yes people were timing me