I'm trying to determine the type of ignition and a wiring diagram for my '68 Merc 650. I have looked at all the diagrams on Maxrules and it seems to be a combination of the 650S breakerless with ignition driver and the 650 thunderbolt ignition. It has "lightning energizer" on what I thought was the distributor but that I now think must be an ignition driver. The switch box has only 4 colors on only one side of the box that matches the diagram for the 650S breakerless but it also has a rectifier and the wires leading out of the internal harness don't match that same diagram. All parts look original so it doesn't appear to have been switched around but I can't find a diagram for this exact engine. Thanks for any help.