Instead of electricity, exchange voltage to moisture. So, Instead of your non contact voltage tester, you have a moisture meter. When you test the outside of your camper, or the wood inside, you want the meter to NOT detect any moisture. But, if you put the meter over a drain or the potable tank fill opening with the cap removed, you want that meter to show a moisture reading. Even though you have moisture detected in the drains and tank openings, your RV is safe from the destructive nature of moisture... meaning mold. So it's ok to detect voltage in the power cords and outlets but, not on metal doors of refrigerators, ranges or metal parts of the camper.
Excellent watch out situation. I've responded to many fires which had undersized wiring as the cause.
Instead of electricity, exchange voltage to moisture. So, Instead of your non contact voltage tester, you have a moisture meter. When you test the outside of your camper, or the wood inside, you want the meter to NOT detect any moisture. But, if you put the meter over a drain or the potable tank fill opening with the cap removed, you want that meter to show a moisture reading. Even though you have moisture detected in the drains and tank openings, your RV is safe from the destructive nature of moisture... meaning mold. So it's ok to detect voltage in the power cords and outlets but, not on metal doors of refrigerators, ranges or metal parts of the camper.