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RV Running Lights Hack

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Use this simple running lights hack to light up your RV at night.

Rockwood Mini Light camper with it's running lights on when unhitched

Have you ever seen an RV unhitched and parked with its running lights on at night? Do you wonder how they have the lights on without running down a battery? Use this quick running lights hack to make it happen.

When we were staying at Wyalusing State Park we became friends with a camping neighbor named Juan. We were sitting around his campfire and when it started to get dark he went over and turned is running lights on. We were wondering how he did this.

Juan told us about how he was at another Wisconsin State Park and most of the campers had their running lights on and it looked cool. He inquired how it was done and tested it out for himself.

Juan shared how he did this to us and now we are sharing it with you.

Trailer Running Lights Hack

Here is a look at Juan’s 7-way hitch receiver plug with a fuse plugged into it.

7-way plug with a fuse in it to make running lights work when unplugged

This trailer hack involves putting a fuse into your hitch plug. You need a 10 amp or a 15 amp fuse.

Juan used a 15 amp for his trailer’s 7-pin connector plug. Stick the fuse into two adjacent slots at a time until the running lights come on.

7-pin connector plug with a fuse in it to make running lights work when unplugged

That is it! You might need to test different slots for it to work. We cannot guarantee that this will work for all campers.

If you are plugged into an electrical pole, you will not draw from the battery with this mod. If you are not plugged in, you will draw from the battery.

Not all people are fans of RV lights being on all night. Please be a good neighbor and remove the fuse before bed.

back of a RV camper with the running lights on while unplugged at a campground with running lights hack words overlay

Thank you to Juan for sharing this simple RV hack. We enjoyed meeting Juan, Jessie, Vinny, and Alex. We are camping friends for life and they are official members of the Let’s Camp S’more Mod Squad. May our paths cross again sometime in the near future!

Do you have a hack, mod, recipe, or anything camping-related that you would like featured here at Let’s Camp S’more? Read how you can join the Mod Squad and get your own Let’s Camp S’more sticker for your RV.

Other RV camper mods submitted to us to feature include Grace’s Dinette Tabletop Replacement, Ken’s Extra Storage Tongue Mod, and Steve’s Awning Bag Hack.

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Friday 12th of June 2020

Like this hack! I am looking to be able to power my rear camera which is tied in to one of my running lights when disconnected from my tow vehicle. That said I would need to do this without the outside lights on. Using it as a security camera. Any info on this? Thanks!


Friday 21st of August 2020

@Shawn, I think you would have to rewire the camera to a 12v power source with a toggle switch. Flip the switch on when driving or keep it on when you want to use it as a security camera.

Let's Camp S'more

Wednesday 24th of June 2020

Shawn, This hack was submitted from a camping friend so we do not know. Sorry!

bill cooper

Saturday 1st of February 2020

how do I do this on a mh for inside show room

Let's Camp S'more

Wednesday 5th of February 2020

Sorry, Bill. I have no idea.


Monday 25th of November 2019

Hmmmm. Didn’t work for my trailer. I’m full time in it in a monthly site. Trailer is plugged into power. All lights work when plugged into my truck. Used a 15amp fuse

Let's Camp S'more

Saturday 4th of January 2020

You may have to find out which holes are actually ground and which are power on your plug.


Sunday 18th of August 2019

I have wanted to do this mod, and actually just came in from trying it, but I don't have power at the trailer plug for me to cross over to the park light circuit. When I got this camper, a lot of the trailer wiring was a mess. Crushed plug and badly kinked trailer cord. When investigating how to do the repair, I noticed all the wires ran up into a trailer compartment where everything was wire nutted together, and then back out the same hole and ran along the frame to their destinations. I didn't like this. I did a little research and found a complete power cord that goes into a distribution box with each function having their own screw on post. Mounted it on the back side of the front cross member. Much cleaner and easy to work on if needed. Also sealed the hole in the floor where rodents could enter. To the best of my knowledge, the battery is being maintained when in tow, and is fully charged right now. ( I disconnect it and put a tender on it when not in use ). I took pictures of all old connections before disconnecting anything and put them back together on the corresponding studs. I will have to check them ALL again to see where I screwed up. All the lights work fine, it's just the one hot circuit on the trailer.


Thursday 16th of July 2020

If you're not familiar with the wiring on the plugs, the easiest way to get it right, is to connect a test box to the RV connection Or, remove the wires from the RV plug, plug it in to the tow vehicle and then using a test light, turn on, say, the parking lights, find the terminal that's now lit up on the tester and install the wire for the parking/clearance lights, then go to the next set of lights and so on. The test box is a little expensive - it's a Croft TTB01


Monday 22nd of July 2019

If you really want to be different with your lights on try using a 2 prong automotive flasher for your connection and ALL your lights will blink on and off like a turn signal. This does work. I've seen it and done it.


Saturday 7th of November 2020

@Wayne, I bought a truck plug & mounted to the camper. Then wired this to truck plug: iMBAPrice 12V, 15 Amps, Heavy Duty Boat and Car Universal Remote Control Kit That way my trailer plug is always plugged in & out of weather. And I have that remote switch that I can turn my running lights off & on with.


Monday 22nd of July 2019

Fun idea!

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