MSD 6AL wiring

Hey gang..
Putting together the MSD 6AL system on my friend '71 Challenger R/T. Curious, all the wires seem to be rather obvious for me, except the red wire that apparently, according to the wiring diagram supplied, goes to the original coil + wire. Would that be the 12V feed on the ballast resistor? It seems on the 6-series modules, the white wire isn't used. Also, apparently you can order the harness PN 8860...

Thanks..
Troy

the red wire you're referring to is the "key on" +12 volts also called ignition sense so it can be powered by any circuit that comes on with the key and stays on while cranking the engine. yes it can be connected to the ballast resistor feed. the white wire is used when triggering the ignition with a points type distributor. the orange and black pair is coil positive and negative respectively. violet is mag +, green is mag -

just remember that one side of the ballast resistor is Run..and the one is STart....the red MSD wire must see 12 volts at Start and Run...

usually have to splice the twice ballast resistor wires together then connect the red wire to them...

Typically the ballast res is deep sixed when you install a MSD -- it's no longer necessary. You already have your answers on the red wire -- the white wire is used for a kill switch. White wire to a switch, other side of switch to ground. Grounding the white wire renders the MSD inop.

Hello All,,,
I'm still sort of confused on where to connect the white wire to. The red I'm good with, the ballast resistor ( I have hard-wired the ballast in the back to give the engine compartment a more OEM look). The orange and black wires to the coil posts. The heavy gauge red to the battery +, but I'll connect it to the hot post on the starter relay switch and then the black heave gauge wire to a ground. Finally, the distributor harness is obvious..

Thanks..

I never used the white wire.

when i hook up the "keyed" power red wire i attach it to the brown AND blue wire leading to the ballast. i am not sure which color wire is which. but one wire has power and cuts out when you turn the switch to crank. the other wire has no power when the key is on and has power when you turn the switch to start.

you can just attach the red keyed power wire to the old positive side of the coil wire. but you have to use the ballast if you wire it that way.

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I never used the white wire.

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me neither,just nix the br and hook the small red wire to a switched soure.