Without the wire harness and connectors it makes the job tough..... what color wires WERE on the carb solenoid .. GRAY & YELLOW ..?? in the diagram, the gray is "shared" with the RED which is getting power from the DC out of the stator, the YELLOW wire on the solenoid, is the GROUND wire which goes back to terminal M on the IGN. sw. which goes to the safety inter lock switches ....... do you have those still on the machine and connected, I CANNOT see what you have there and as I said without the connectors it's a headache, go look at the pictures I sent and see how the wires are looped in the connectors.
you should have 4 (four) wires coming FROM the engine, a RED & BLACK (from the stator) and a GRAY & YELLOW from the solenoid these go to 2 (two) small connectors which in turn go to the main harness, which connects to the ign. sw. if the safety switches are hooked up (and working) you MUST be sitting in the seat, blades DIS-ENGAGED, and trans in NEUTRAL with CLUTCH pedal pressed down, JUST BE SURE THAT WHICH EVER WIRE YOU HOOK TO THE COIL, .. DOES NOT HAVE VOLTAGE WHEN THE KEY IS IN THE ON POSITION !!!!! AS I stated earlier if you plan to keep the machine I would buy the wire harness's and end your nightmare ! It's NOT worth the aggravation and problems later . also : some Murrays used different color wires and some were wired a bit differently, without your exact model number, we're shootin in the dark, might have to check out a different harness set-up, and start over. .. ??