You can determine the amount of current being used and charged on your tractor’s system by placing the meter in-series with the circuits of the tractor. To do this: first remove your red probe and plug it into the 10 amp Max port on your DMM. Then set your DMM to DC Current with the range of 10 amps. Now you unplug the wire going to your ignition switch’s “B” terminal. By clipping alligator clips to your DMM probes you can now connect one probe to the “B” terminal of your ignition switch, and your other DMM probe to the wire that normally goes to “B” terminal on the ignition switch. Now when you run your tractor the current will flow through the meter and your DMM can give you a reading. It will tell you how many amps are flowing through your system.
I hope this basic explanation of tractor wiring helps you make sense of the tangled mess in your tractor. This was just a basic overview of wiring concepts. You can add additional components to your tractor such as safety switches, fuses, ammeters, hour meters, indicator lights, etc. They all will be wired in a similar fashion to above. The most important concept to remember is you need a closed loop or circuit to have electrical flow, and it’s best to visualize your wiring in separate circuits.
D-42 - Engine Wiring Diagram Specialist
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