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Also check the fuse holder. If the holder has rust/corrosion it may not hold the fuse tight and cause it it heat which will cause it to blow at a lower amp load than it should. A 20 amp fuse can blow at 10 amps if the fuse gets hot. This is called "cooking". When a fuse cooks it damages the holder even more until it is totally useless.
All connections are rust free. The fuse size was a 20 amp fuse. I bought this mower used, so I'm not sure of the fuse size for sure. I have tried 15, 20, 30 amp fuses. I can't find a wiring diagram for this ZTR mower
Did the 20 & 30 amp fuses take the same amount of time before they blew?
What I'm thinking, is IF they did, it's a heat related issue. Something starts drawing excessive current when it gets hot or something "moves", causing a short. Just what "heat related issue", I don't know.
DOES the ammeter start showing increasing current flow before the fuse blows?