Help - electrical issue!

[ROBERTSUNRUS]

Hi, I have, and suggest, that every trailer has these three things; And they don't cost much. First thing is a polarity tester. [very important to have] I have one plugged into a kitchen outlet and it is the first thing checked after plugging into shore power and before turning anything on. Next, I have a Kill-A-Watt, also plugged into an outlet in my kitchen; It mostly tells me what voltage I have coming in and cycles. [Hz] And lastly, I have a DC [12 volt system] battery voltage checker.

[Phoenix]

All good suggestions... Slight variation; I plug the polarity tester into the campground power box to test it before connecting the shore power cable. Never thought about leaving the Kill-a-Watt plugged in all the time to monitor the voltage -- excellent idea!