Hi everyone, Im currently trying to wire my MSD box up. I am trying to clean up the wiring at the same time and bypasss the ballast. The thing is some of the wires that go to the ballast were replaced with non origonal ones so the oem wiring diagrams dont help much. I was thinking about doing this from inside the car(behind bulkhead) so I can remove the wires forward for a cleaner/less cluttered look in the engine bay. Ill mount the voltage regulator underneith dash to. The car is a '74 Dart 318 car. There are 2 FLD - blue wires tied together that come off the alternator and then a green FLD + then the larger one that connects to the battery and then a yellow/black IGN wire. If im doing this from under the dash, I connect the IGN wire to the 1 of the FLD - blue wires then to the larger brown wire, then the extra FLD - is connected to the voltage reg along with the FLD + ?

Hope this makes sense, thank you all!

Hello Ori, To bypass the ballast you could connect the ign1 (run) blue wire circuit and the ign2 (crank) brown wire circuit together & run that connection to the coil positive primary terminal and to the MSD trigger wire which iirc is the small red one to power both the coil and the MSD in run and in start. You could T em together before (like you are considering) or after the bulkhead & also connect from that T to the blue wire to the alt field and to the reg top terminal in the triangle connector. You are powering up the coil the reg the alt field the MSD. Where is the black/yellow wire on the (blue I'm assuming) alt field terminal going to?

Since the MSD needs a clean 12v signal, I decided to splice into my Blue wire/Brown wires at the steering column. This eliminates any voltage drop from the stock connections under the dash, through the bulkhead and up to the ballast area.

NO YOU DON"T hook the Start and Run wires to the coil!!!
You tie them together and hook them to the thin red wire coming out of the MSD. Their only function is to turn the ignition box on. Power to the ignition box comes from the large Red and large Black wires hooked directly to the battery.

Then there are the two wires from the MSD box that hook to the coil. These are the only wires hooked to the coil.

Then there are the trigger wires hooked to the electronic pickup, or the white wire hooked to the points.

It must be terribly frustrating to install an ignition box without looking at the directions, which are available online and should be in the box if you bought a new unit.

R.

I got the rest of the msd box hooked up except the one small red wire. I do have a painless wiring 10 port ignition box that has 5 constant powers and 5 keyed powers, could I just hook the small red wire to one keyed wires to simplified things? I'm just confused about the voltage regulator/alternator wires. The 2 blues and 1 green from alternator, one of each goes to regulator, where does the other blue go? To the brown wire under dash bulkhead?

Like said above...hooked the small red wire to a keyed 12 volt source...that wire turns the msd box on and off...

so hook it to your ignition switch...

Here is a wiring diagram I made up, JUST so I can understand it better. Im probably making this harder then it really is But does this look right?

You have a brown going from the column up to the horizontle blue that connects an alt field (blue wire) terminal to the reg top terminal. You would need that to be hot in ign1 (run) so the reg/alt are powered in ign1 so it is charging while the eng is running so the wire that feeds that would need to be the blue ign1 circuit. IF that brown is the same circuit as the ign2 "start" brown it'd be dead as soon as you let off the key. The brown wire "ballast bypass" on the downstream end of the ballast would be getting some current thru the ballast (what the coil sees) in ign1 run but it'd be reduced & not correct to feed the reg/alt. I think what I posted earlier on the MSD wiring was incorrect so I retract that. My bad.