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Iffin you don"t find a parts breakdown, MF dealer, or other reputable source, to answer your question, here"s something that could help. Purpose of fusing is to protect wiring from coming to a temperature that will melt the insulation. So, different wire material and different insulation types dictate different fusing. My rule of thumb, for general purpose wiring, like would be found on a tractor, with copper conductors, and rubber or thermoplastic insulation the following wire sizing is appropriate: (From the NEC, Flexible Cords based on an ambient of 86F*):(Sorry the editor runs this table altogether) Current capacity, AWGauge , Cond Dia (in) 10 amperes , 16 , .051
15 amperes , 14 , .064
20 amperes , 12 , .080
30 amperes , 10 , .101
100 starter gas , 1/0 , .325**
200 starter diesel , 2/0 , .364** * Different insulating materials allow for higher ambient temperatures. Some thermoplastics are rated at 220F. Is all your wiring original? ** Either is excessive from a temperature standpoint. What"s desired here is the lowest voltage drop across the wiring in the starter circuit, so the larger the better. Your wire is what you are protecting with the fuse , so it is your basis for the size, not the load you"re handling, per se. You might turn your engine off, key on, all electrical acc including lights on and read your ammeter. (Need to have the engine off so that the gen/alt doesn"t give you a false reading.) Then check the diameter of your wiring and and size the fuse accordingly. One last note: A (The) fuse is rated to interrupt a given current, holding off a given voltage in the process of circuit interruption, in a given time, at a given temperature. Lots of variables in selecting a fuse. I know it"d be nice to have the original, but what says your tractor is original? Hope this helps. Mark
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