Big Block Wiring

[Nacho-RT74]

HONESTLY, I think this is a better diagram ( stock for 72s )

[Nacho-RT74]

ok guys after a little more research managed to find a couple of diagrams on the web,i beleive it matters that the dual ballast must be wired the correct way round as both sides are differant(you can tell by the slot in the resistor,will see how it pans out

THIS IS NOT CORRECT FOR MOSTLY PRE 75 MOPARS, just for those with bigger starter relay and dual ign prongs, which feed the bypass ballast from there and not anymore from ign switch... setup used on mostly of post 75 mopars

[ACUDANUT]

You tell them nacho. 

[Roctania]

Engine fired and ran great for about 15-20 minutes.  Got up to temp OK.  Choke working OK, just about to get it to idle down and behave when it quit and would not restart.  No spark now. 



More troubleshooting of the 4-pin 5-wire 1-ballast or 2-ballast system I guess.

1971 Challenger 440

Harumph... aftermarket wiring harness, the two brown wires in one spade connector at the ballast resistor PULLED OUT of their crimps.  WTH?

[VegasCharger]

Okay let me see if anyone has this set-up, highly unlikely.
68 Charger 383 equipped converted to electronic ign.

Single field alt.
5 pin ECU
Old school Volt reg. with updated solid state guts
2 prong Ballast resistor

Bill Evans from Evans wiring made my harness as well as suggesting that set-up once I told him what I was doing with the car.

I would be hard pressed to draw a diagram on this set-up. And the reason I said highly unlikely that most guys that do the elec. ign. conversion usually go with 2 field alt and 4 pin ECUs. Nothing wrong with that at all. I just took advice from Bill even though I was puzzled at the time he explained it to me.

Charger runs fine with that set-up

[Nacho-RT74]

if the brown wire pulled out form ballast, the power to coil has being cut...


you can get dual prong alt or single prong alt ( AKA dual field or single field alts ) to be matched with the old "mech" reg, or electronic respectivelly... BUT is adviced to use electronic regulator with electronic ignition, since is more stable and electric noise free ( given by the mech regulation )... so an old setup with electronic inners  should be fine too.

The only diff on alternator itself between dual and single prongs is the pole is used to be regulated. On dual, the ground is the regulated field, hence both fields are isolated from alt case, on single the positive source is the one being regulated hence the ground field is directly feeded from chasis and is not isolated.

[A383Wing]

Okay let me see if anyone has this set-up, highly unlikely.
68 Charger 383 equipped converted to electronic ign.

Single field alt.
5 pin ECU
Old school Volt reg. with updated solid state guts
2 prong Ballast resistor

both my 66's are this way....runs fine...for now, until I change over to different ignition system this spring