MG Car Repair: 79 midget wiring diagram, opus systems, starter solenoid

Question
My car is turning over but has no spark. There are about 6 wires going to the coil. and one wire is not hooked up to anything it is white wite a blu or maybe green stripe. Do you know where I can find a wiring diagram?

Thanks
Matt
mattkope at gmail dot com

Answer
Matt,
Unless someone has rewired the ignition for some reason like installing an aftermarket ignition system. Which would explain extra wires not connected. There are only 4 wires connected to the coil. Two white w/black on the negative side. (one to the dist. and the other to the tach). Two white w/light green on the positive side. (one to the starter solenoid and the other to a resistor wire and on to the ignition switch with branches going off to the dist and to the fuse box and other places.
The ignition system on your car came with a Lucas Opus ignition system which is the box mounted on the dist and supports the vacuum unit. These Lucas/Opus systems were very prone to fail. (even before they got out of warranty) Several aftermarket ignition systems have been available over the years. Look closely at the wires coming out of the box to see if they have been clipped and look at the pick-up to see if it is directly wired to the coil. If so, it is for sure an aftermarket system. Read what is written on the pick-up in the dist to see what brand it is. Then look through all of the paper work to see if the paper on the ignition system is included. This might have the new wiring of the system. If the pick-up has just two wires and they both go to the coil (accounting for 6 wires) then it may be a Purlux system. If this is the case, you should find the two wires inside the dist coming from the box and the three wires outside from the box all clipped off. If it is one of the other aftermarket systems you will have to try to search the net for the manufacture to find out how it was wired. If you get a name off of it you may try to ask Moss Motors as they handled some different systems over the years.
I hope this helps,
Howard