How do you turn the pump off? If it runs regardless of the switch how do you keep it from running the battery(s) down? Or, if it is your first tryout of the new to you trailer and it runs continuously see if you can find the fuse for it and pull it.
I would replace the switch first as Marshall suggested, or, pull the switch and use a meter to see if it is actually opening/closing the circuit. Being a "new to you" trailer there is no earthly telling what the previous owner may have done, heck they may have "hotwired" it.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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