MG Car Repair: More ignition problems..., ballast resistor, starter solenoid

Question
I had wrote a question a few months ago about my 1976 MG Midget having a wiring problem. I figured out that I couldn't get a spark from my coil because my XR-700 ignition module had somehow shorted out. Therefore, I had bought a new Lucas distributor that uses a Hall effect sensor (thinking that this would solve the problem.) Once I had properly installed it into the motor, it sparked and worked like never before. Suddenly, after running it for about 30 miles or so, when I was letting it idle outside of my house, it died. It wouldn't start again or even spark (the same problem as before.) I had it's positive wire wired with the white ignition wire (running directly from my key ignition)on the positive terminal on the coil, along with a wire connecting from the starter solenoid. On the negative terminal I had the distributor's negative wire along with the tachometer wire. Also the coil has a ballast resistor. I have three loose wires (1 white/black, 1 white/green, and 1 solid white.) I traced these wires and noticed that the extra white and white/green are all in the same circuit with the white ignition wire. I am not sure on where the white/black wire comes from but when the key in on run, it has a charge. I know that something isn't right with this wiring and it really needs fix before I install a new igniton. Please help because this is starting to get expensive and I still need a vehicle.
Thanks,
Matthew

Answer
Hi Matthew,
The color of the loose wires you tell me about are the normal wires for the ignition system. I believe you need to look closely at a wiring diagram and start tracing wires one at a time in the ignition circuits. And confirm each and every wire, that it goes where it is suppose to and no where else. That is how I had to do it in the dealership.

A few other things you need to look at is the coil primary resistance to see if it matches the ignition system you purchased. Also when you get it running again, check the charging voltage as a high charge rate can scramble a new ignition system.

If you don't have a diagram, go to my web site and copy one off my site. http://mg-tri-jag.net/76Midget1x1.jpg and 76Midget21x1.jpg for the diagram and the index to the diagram.

Diagrams are not easy to follow so I have been thinking of drawing my own on the design used by Jaguar in their training school. I have most of the diagrams for most of the MGs, Triumphs and Jaguars.

Howard