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In a 50 amp coach, you have two input legs of 50 amps each. You can very easily have different voltages on the legs depending on the electrical draw (watts used). The front part of my coach is on leg 1 so if the A/C is on and the GFCI kitchen is being use the voltage is around 118 on leg 1, while leg 2 is reading 121 volts. Turn on the electric water heater, microwave, rear A/C and leg 2 voltage will drop to 116 volts while leg 1 remains at 118 volts. I have a Progressive HW50-EMS so monitoring leg voltages is easy.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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