RV Electricity – Just Ask Mike (J.A.M.): Leggo my WAGO…


By Mike Sokol

Welcome to my J.A.M. (Just Ask Mike) Session, a weekly column where I answer your basic electrical questions. If you’re a newbie who’s never plugged in a shore power cord (or ask – what’s a shore power cord?), or wonder why your daughter’s hair dryer keeps tripping the circuit breaker, this column is for you. Send your questions to Mike Sokol at mike (at) noshockzone.org with the subject line – JAM.

Dear Readers,

This could be the greatest innovation in wire splicing technology since the invention of the wire nut. And it looks like the RV industry is adopting it quickly. It’s the WAGO 221 lever action splicing block.

Why am I excited about this? Well, traditional wire nuts are notorious for being difficult to install properly, especially once you’re trying to splice more than two wires together. Plus, it’s difficult to get a visual indication of proper termination. Yes, wire nuts are a big failure point in RVs (as well as home wiring).

A few months ago when I was teaching an RV technician class one of the senior technicians gave me a WAGO 221 splicing block to play with. So I threw it in my glove compartment and forgot about it. However, just last week I was doing a consult on an RV that had developed a hot-skin voltage condition, and the repair shop foreman showed me a big box of WAGO connectors in all sizes, and said that Forest River was now using them on their new RV builds, and that his technicians loved them. So I took a few home to try.

Well, I do believe this is a great advance in reducing electrical failures due to overheating and intermittent connections due to improperly installed and maintained wire nuts. That’s because 1) the WAGO connector is clear, allowing you to clearly see when the conductors have been properly stripped and seated; 2) they clamp down with a spring-loaded lever you can’t over-tighten and which can’t loosen up from vibration; and 3) the more you pull on the wire, the tighter it grips the conductor. Very cool. It appears that Progressive Dynamics (the company that manufactures the circuit breaker panel in your RV) is utilizing the WAGO connector instead of screw termination in some of their products. Now, that’s getting interesting!

I’ve already contacted WAGO for technical literature and some samples to experiment with, but these lever-action splice blocks could go a long way to reducing wire nut splice failures in your RV. And yes, you can indeed get them on Amazon HERE.

So are wire nuts dead? Certainly not. But unless they’re installed properly to begin with they can be a big source of failure and frustration in RV electrical systems. And if improperly installed they can become a source of overheating and a possible fire inside the walls of your RV. If used in any kind of moving vehicle, they really should be secured with electrical tape to prevent them from loosening up due to road vibration.

OK, everyone. Remember that electricity is a useful and powerful force, so we all need to pay attention to safety precautions while using it.

Let’s play safe out there….



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Mike Sokol is an electrical and professional sound expert with 40+ years in the industry. His excellent book RV Electrical Safety is available at Amazon.com. For more info on Mike’s qualifications as an electrical expert, click here.

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Looks promising, but here in Canada way to expensive for regular user.
The link to Amazon list a $20.97 price for a box.
The same in Amazon Canada is $87.99

Ralph Pinney

Hi Mike,
I’ve never seen a WAGO connector so pardon my ignorance. Is there sufficient surface area of connection? With a pair of wires are twisted or a wire is wrapped around a terminal and the screw tightened there is a good deal of area of connection for current passage. Is this a potential problem?
Keep up the great work.

Steve Kight

The problem I see with WAGO connectors is that they make it easy for unqualified people to do electrical work. If you can’t install a wire-nut correctly, you shouldn’t do electrical work.


Bought a box, just for the neatness. Going to use some today. Never really trusted wire nuts.

Robert Fedor

They are most common in recess lights that are sold in home depot and lowes very easy no wire nuts needed


I have these on my Grand Design and so far I have found six of them with the lever flipped open. These have been replaced with crimp connectors and the rest will be as I come across them.

G Fred

I recently bought a Progressive Dynamics Automatic Transfer Switch, PD5110010Q. Instead of the normal screw connector bus, it came with WAGO’s. Taping up the each connector lever is a good preventative measure.


The first inverter in my fifth wheel was a Xantrex 2500 watt & after 4 years of fulltiming, it burned up inside due to road vibrations loosening up the wire nuts connecting the incoming lines. It literally burned up inside, but fortunately did not damage the rest of the rv. My current Xantrex 3000 watt pure sine has a totally different type of wire terminal set up.

Joe Bulger

Mike, I’ not convinced that the waggo is any better. I have brand new 2020 sports coach and the 12 volt lights in the bedroom and rear bathroom stopped working. Being on the road I started to investigate, I’ll give you one guess where the failure was. If you lift up on the orange tab the wire will release and no matter how hard I tried it would not stay closed. Now all three wires are soldered together, wire nutted and taped. Any mechanical connection is a failure point and I hope they did not use them on high current loads as I feel that by pinching the wire does not give good current varying capacity.

Bob Godfrey

Nice suggestion. Thanks.


Very neat. I’ve always disliked wire nuts. If connecting wires of different gauges, they tend to fail.


Your statement, “source of overheating” … “possible fire inside the walls” confuses me.

I was under the impression that: 1) connections can only be made inside a box and 2) boxes cannot be hidden/must be accessible.

Am I missing something?