Electric motors drawing maximum current at stall, perhaps a/the fan motor(s) experience rotor drag sufficient to blow the fuse. Maybe blowing has kept windings from cooking.?
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30 amp is just what the instructions (busaru) I followed called for when I put it together a few years ago. It¡¯s worked fine til now. I will say that during my initial test drive to trouble shoot this issue I blew the 30 amp and only had a 15 amp fuse available, which worked fine to get me to the gas station. Later on while monitoring amperage on that circuit it was always below 10 - until it blew the 30 I guess. All that to say I¡¯ve got a 15 in there now and will run that going forward once I track down the issue.
Given the apparent relationship to temperature, could it be the radiator fan motor?
any guidance would be appreciated. I¡¯m pretty good at following instruction but I lack the fundamental electrical knowledge to troubleshoot in a methodical way on my own.?