By Mark J. Polk
If you don't know what the voltage is coming into your RV, you risk damaging thousands of dollars' worth of electrical appliances and electronic equipment. I have always recommended that RVers use some type of portable digital meter to measure AC line voltage, frequency and test polarity.
You should test the AC voltage at the campground to make sure it is in an acceptable range before using any appliances or electronic equipment, and you should monitor the voltage throughout your stay at the campground.
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Newsletter - Camping World