Reverse polarity checker – essential!

Reverse polarity checker
  • Pricing and value for money - great, under a fiver
  • Product quality - well, it's still going strong
  • Worth having? Without a shadow of a doubt


A “must have” for those travelling overseas. Worth having even if your ‘van has a built in reverse polarity checker. This device allows you to check every socket individually. Ideal for routine checks and maintenance.

User Review
4.93 (14 votes)

When travelling overseas, the electrical system on the hook up post may be wired differently to that in the UK. Consequently, reverse polarity may occur. The easiest way to determine if your electrical supply is affected by reverse polarity is by the use of a “reverse polarity checker”.

To check for reverse polarity, connect your unit to the mains hook up post on site. Next plug the reverse polarity checker into one of the 230 volt mains sockets within the caravan or motorhome. A series of lights on the reverse polarity checker will tell you if you have a problem. Reverse polarity basically occurs when the live and neutral wires are reversed. Some motorhomes and caravans have a built-in warning systems within the ‘vans electrical system. This is often a red light on main electrical control panel. If you do not have this system, it is worth spending a few pounds on a reverse polarity tester.

Reverse polarity checker

Reverse polarity checker

Reverse polarity checker – order online today!

These are available in many high street electrical stores and camping accessory shops, although I purchased mine online as it was the cheapest by far!  Click on the Amazon logo below for more information.

…but what is reverse polarity in the first place?

As mentioned above, reverse polarity occurs when the live and neutral wires are in reverse. Further information is available here. Should you decide to make your own short electrical lead with the reverse connection, you will require an extra pair of CEE sockets. These are available online from Amazon.

The reverse polarity checker is one of the smallest accessories on board. However, as my granny used to say – “worth it’s weight in gold”. The gadget does not need batteries. It takes power from the 230 volt socket when testing the system. From time to time, we test every socket in the motorhome as part of our “maintenance and care” routine.

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