How to Wire 12v Campervan Lights (Ultimate Guide)

In this guide you will learn how to wire 12v Campervan lights (campervan LED strip lights, LED puck lights, and LED lamps). You will even be able to control the campervan LED strip lights on your phone via bluetooth! By the end you will have a beautifully illuminated van!

I’m Shane, I’ve been teaching people to convert campervans for years; I’m the author of Roaming Home; The Comprehensive Guide for Converting Your Van Into a Campervan, writer of The Van Conversion Newsletter, Instructor of The Van Conversion Course over at Udemy. And full-time vanlifer for 4 years! 

Now let’s jump in and see how to wire 12v campervan lights!

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What is an LED light?

An LED (light emitting diode) is a semiconductor that emits light when electricity flows through it. Electrons in the semiconductor combine, releasing energy in the form of photons. The colour of the light is determined by the energy required for electrons to cross the band gap of the semiconductor.

>>> Read more: Seeing the Light: The Beauty and Benefits of LED Lights

LEDs have many benefits over traditional incandescent lights, including: lower power consumption, longer lifespan, robustness, smaller size, and faster switching. However, for all their benefits, LEDs are generally restricted to low voltage and DC. This makes them perfect for van conversion lights!

What types of LED lights are used in campervans?

There are three types of LED lights typically used in campervans, those are:

1. Strip lights
2. Puck lights
3. Side lamps

In this article we will look at wiring led lights to a 12v battery for each of the three types above. We will also examine how to wire the campervan LED lights to a switch and the 12v light switch wiring diagram.

Wiring 12v campervan lights in series vs. parallel

A puck light has two wires extending from it: a positive and a negative.

There are many different ways to wire up puck lights, and while there is no one right way, wiring lights in parallel is generally preferred over wiring them in series.

There are two problems with wiring puck lights in series (daisy chained):

1. If one light breaks, every light after that one will also turn off.
2. Wiring LED lights in series can cause different lumens to be output from the puck lights. The first light will be the brightest and the last light will be the weakest. The effect is amplified as we add more lights.

One nifty device you can use to wire up all lights in parallel is a DC 8-way splitter (if you have 8 puck lights). It connects 8 wires into 1. You can just snip off the heads and wire it up to the lights.

However, while wiring campervan LED lights in parallel is preferred, it can cause a lot of extra wiring to be needed. Because of this, most people will opt for a mixture of parallel and series wiring.

Campervan lights wiring diagram

In the previous campervan lights wiring diagram, the two LED puck lights in each set are wired in series. But the sets themselves are wired in Parallel.

For example, if the first light of the first set blows, the last two sets will still stay ON, but the second light in the first set will turn OFF.

>>> Follow us to discover the Best 12v led strip lights

As we can see from the diagram, we will be installing a dimmable switch for the puck lights. We install this after the fuse box. You can learn all about fuses and fuse sizing in this guide.

Note: You will want to purchase some dimmable LED puck lights; we will be looking at how to wire them to a 12V dimmer switch.

How to wire campervan LED puck lights

Step #1: Lay the cabling

Laying wiring is one of the very first things you do in a van conversion; before touching any insulation or carpentry.

Before laying the cable you need to know where in the van you are going to put:

1. The leisure batteries
2. The fuse box
3. The switch panel
4. The 12V lights

After you have decided where these things will go, go ahead and lay the wire. 0.8 mm² (18 AWG) wiring should do the job just fine (though you should do your own wiring measurements). Some people choose to run the wiring through conduit / split looming to keep it neat, others will keep the wires exposed. You can attach the wires to the metal surface of the van with cable ties and cable tie adhesive mounts.

It is common to install 6-8 LED puck lights in the ceiling of the van. We run a Positive (red) and Negative (black) wire out to all the lights.

We can use T-tap connectors in two places in order to wire the puck lights per the wiring diagram provided. The T-tap connectors will allow us to wire the LED lights in parallel.

You can learn all about how to cut, crimp, and use T-tap connectors in this article on crimping.

Step #2: Wire the LED puck lights

We can attach the puck lights to the wire using crimp connectors.

1. Strip back the wire insulator half an inch on both the puck light and the wire
2. Add a male crimp connector to one wire and a and female blade crimp connector to the other wire
3. Crimp the connectors down with a crimping tool
4. Add a heat shrink on top of the connection to insulate the connection (Only do this after you have cladded/panelled your van are ready for the final installation)

Note: In a set of two puck lights in series, the negative of the first puck light runs into the positive of the second puck light.

Step #3: Wire the switch

Most people will want a 12V dimmer switch (like the one shown below) rather than a simple ON-OFF switch – so that’s what we will look at here.

12V light switch wiring is quite simple: Positive and Negative IN (from the battery) are on the one side of the dimmer switch, the Positive and Negative OUT (to the puck lights) are on the other side of the dimmer!

Step 4#: Wire the switch to the fuse box

From the switch, the Positive and Negative IN will run to the 12V fuse box, which in turn runs to the bus bars and on to the leisure batteries.

How to wire LED strip lights in a campervan

The second type of LED light we can wire in are campervan LED strip lights. I have two sets of LED strip lights in my van, wired to turn on in unison. I also have a bluetooth dongle that allows me to control the colour and brightness of the strip lights from my phone. So, let’s look at how to wire that system up.

Like the puck lights, we will run positive and negative wiring from our fuse box out to where we expect the campervan LED strip lights to be.

How to wire 12v led lights to a switch

Step #1: Stick the strip lights

The strip lights have an adhesive strip along the back which allows us to stick them to almost any surface. I chose to install mine under the overhead cabinets.

Step #2: Install a switch

We install a switch (non-dimmable) after the fuse box and then wire up the strip lights in parallel.

Step #3: Cut the strip lights to length

You will need to cut the campervan LED strip lights to the desired length, which you can do at one of the cut points on the strip.

Step #4: Add strip connectors

After you have cut the LED strip you will need to add an LED strip connector to the end of it so that it can be wired up. These strip light connectors can easily be bought online.

Step #5: Install the connector dongle

We will be adding a bluetooth dongle to the end of each LED strip light so that we can control the colour and brightness from either a remote control, or from our phone. Plug the bluetooth dongle into the strip connector we just added at the end of each LED strip.

Step #6: Wire the Bluetooth dongle

Snip the end of the Bluetooth dongle off and rewire it. Run the Positive end to the switch, and run the negative end back to the fuse box. We can splice the Positives and Negatives of multiple strip lights together with T-tap connectors; this means the strip lights are wired in parallel.

How to wire LED lamps

I installed two LED lamps (12V campervan lights) in my campervan; one in the kitchen, and one by the bed for reading. These are very straight-forward to wire up.

Run wire from the fuse box out to where the LED side lamps will be. We are wiring these lights in parallel, so splice the wires together using T-tap connectors near the switch panel.

>>> Follow us to discover the Low voltage led light strips

We can then simply connect each side lamp to the wire using quick disconnects. Be sure to heat shrink the connection afterwards to secure it.

12v led lights flickering problem: How to fix it

Sometimes when the inverter (or other appliances) draws a heavy load (eg. to power a space heater), you will encounter a 12V LED lights flickering problem in the campervan. A larger, high quality pure sine wave inverter will help solve this problem. If the problem persists, you might consider running the inverter directly from the leisure batteries, rather than from the shared bus bar. This adds a degree of separation from the 12V appliances.

What size cable for 12V LED lights

To calculate the size (diameter) of wire needed in a system we need three variables:

1. The length of the wire (distance to the appliance AND back)
2. The amps the wire will be carrying (ie. the amp rating of the appliance)
3. Acceptable voltage drop

Note: Voltage drop occurs when the voltage at the end of a section of cable is lower than at the beginning. Voltage drop normally occurs when there is resistance in current flow usually due to cables or connectors. For critical circuits we should use the value ‘3%’, for non-critical circuits (eg. LED lights), we can use the value ‘10%’.

With these three pieces of information we can consult the diagram on the following page. Given the length of wire, amperage, and circuit type, it will tell us the gauge of wire we will need. Alternatively, you could use the calculator at circuitwizard.bluesea.com

You can learn all about wire sizing in this guide. In most van conversions, you will use 1.5mm² (16 AWG) for 12V LED lights – though I encourage you to do your own wire sizing calculations.

What fuse to use for 12V LED lights

After you have calculated what size cable is needed, you will need to find out what fuse to use for 12v led lights.

We use blade fuses for 12V LED lights; they are installed in a 12V blade fuse box.

The rule of thumb in fuse sizing is that you should ‘always select a fuse size to protect the wire according to its rating.’ However, most amateur campervan builders should always size wires larger than they think they need. Most of us are not looking for maximum cost/weight efficiency, we are looking for maximum safety.

So, to calculate the fuse size, we should calculate the total amp rating of the appliance the wire is feeding and add on a 25% buffer. When we talk about the ‘size’ of a fuse, we mean its ‘rated amperage’ as mentioned above.

Example: Let’s say we have eight 12V puck lights which are 3W each. The amp of each light would be 3W ÷ 12V = 0.25A. We have eight of them so: 0.25A × 8 = 2A. We want to give ourselves a 25% buffer, so we will choose a 2.5A fuse for this system.

You can learn more about campervan fuses and breakers in this article.

FAQs

1. How do I choose the right type of lighting for my campervan interior?

   • When selecting campervan interior lighting, consider LED lights for their energy efficiency, brightness, and durability. Choose between different styles like overhead lights, under-cabinet lights, or flexible LED strips based on your needs.

2. What are the advantages of using LED lights for campervan lighting?

   • LED lights are ideal for campervans due to their low power consumption, long lifespan, and minimal heat output. They are energy-efficient and can withstand the vibrations of travel.

3. What safety precautions should I follow when wiring 12-volt campervan lights?

   • Ensure all wiring is properly insulated, secured, and protected from abrasion. Use the correct fuse ratings, and double-check connections to prevent short circuits or electrical hazards.

4. Can I use standard household wiring techniques for my campervan lighting setup?

   • Campervan wiring requires specific techniques due to the 12-volt system. While some principles overlap, it’s important to follow guidelines for low-voltage DC systems.

5. What types of switches are suitable for controlling campervan lights, and how do I wire them?

   • Use rocker switches or push-button switches designed for 12-volt systems. Wiring varies by switch type, so refer to the manufacturer’s instructions or wiring diagrams.

6. Are there specific circuit diagrams or wiring schematics I should follow for campervan lights?

   • Yes, you should use wiring diagrams and schematics designed for campervans. These guides help ensure proper connections and prevent electrical issues.

7. How do I determine the appropriate battery setup to power my campervan lights?

   • Calculate your total power consumption, considering all devices and lights. Choose a deep-cycle battery with sufficient capacity, and install a charge controller to prevent overcharging.

8. What are the options for interior lighting designs in a campervan conversion?

   • Interior lighting designs can range from minimalist to elaborate. Common options include overhead lights, reading lights, under-cabinet lights, and LED strips. Choose a design that suits your style and needs.

9. How can I wire and install exterior lighting, such as awning lights or headlights, on my campervan?

   • Exterior lighting requires proper wiring and weatherproofing. Follow manufacturer instructions, and consider using waterproof connectors and fixtures. Ensure exterior lights are securely mounted.

10. Are there any recommended resources or guides for DIY campervan wiring and lighting projects?

    • Many online resources, forums, and campervan conversion guides provide detailed information on wiring and lighting. Refer to sources like campervan conversion websites, YouTube tutorials, and DIY forums for guidance.

Conclusion

And that’s about it! Everything you should know about 12v campervan lights!

Don’t forget to subscribe to The Van Conversion Newsletter for everything you need to get started with your own van conversion (I’ll send you a free wiring diagram when you join).

If you’re looking for some guidance with your van conversion, you might be interested in Roaming Home; The Comprehensive Guide for Converting Your Van Into a Campervan. In the 380-page book (or ebook), you’ll learn directly from me how to convert a van into your dream home – no prior experience needed!