I am going to be complete in my discussion, so some might not apply. First to assure there is no mag damage do not connect it up as though it was the coil and points system!!!!!!! The mag works with no connection at all except to the plug wires. It must never get electricity in the small side terminal. The side terminal is a kill terminal connected to the mag points, it is used to stop the mag from operating (shutting off the tractor)by being grounded through a very different acting ignition switch that looks the same as the old one except that it has only one terminal not two. It is a grounding switch. The wire from that single terminal goes to the side terminal on the Mag. The switch is open when pulled out (the opposite of the point and coil switch) The switch body is grounded through the oval electrical box, completing the grounding of the Mag to stop the engine, when pushed in. The original ignition button can be used if the wire feeding it from the load side of the amp meter is removed from the amp meter and grounded to the box. Using it this way is confusing because it must be pushed in for run and pulled out to stop. (not recommended but works while the correct switch is on its way.)
DO Not Connect voltage to the Mag!!
The lights must get electricity to operate. The new light switch is not getting electricity to the correct terminal. Farmall Cub Dot Com has nice pictures of the wiring of the switch. The included diagram is correct. Note the F terminal on the cutout is not used, leave it disconnected as shown in the diagram.
The Amp meter is connected only to the Big stud on the starter switch that also connects to the battery with 10 gauge wire(Ms have several switch systems for the heavy current to the starter motor. It must connect to the stud connecting to the battery Negative terminal at the starter switch for 6V positive ground from the factory setup.
The other side of the amp meter connects to only two places: The Cutout Relay Bat terminal with a 10 gauge wire, and to the light switch fuse terminal as shown.
The F terminal on the Generator is connected to the lowest shown terminal on the light switch. It is a ground to operate system. which means the light switch provides ground for the field, either through the resistor (low charge "L") or directly to ground through the switch body and light box (High charge and all other positions) The light switch is in the same housing as the Charge control switch and mounted on the same shaft, but electrically they are separate. Your light switch is well grounded (tested with a light in your pic) that is a good start as one common issue is either rust in the connections to ground, or new paint.
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