What to check when your caravan electrics stop working
Few things are more frustrating than electrical problems while you’re on the road or setting up camp. The 12V system in your caravan powers lights, water pumps, fridges, fans, and chargers—so when it stops working, it can affect your entire trip.
Most 12V electrical faults
can be traced back to a few common causes. With a bit of knowledge, you can often narrow down the problem before calling in the experts.
Start with the Basics
Before diving into wiring or components, check that your battery is charged and connected properly. A flat or disconnected battery is often the reason your lights or water pump aren’t working. Even if your battery seems fine, poor connections at the terminals or corrosion can interfere with power delivery. Give all terminals a clean, and check that leads are tight and secure.
Also, make sure your battery is being charged correctly—whether by solar, your vehicle’s alternator, or a mains charger. A faulty charger or blown fuse in the charging circuit can leave you unknowingly running on an empty battery.
If you’ve recently installed a new solar panel or DC-DC charger, double-check that the system is correctly wired and configured. Mismatched charging components or incorrect settings on a solar regulator can silently prevent the battery from charging—even on sunny days.
Look at Your Fuses
Most caravans have a fuse box for 12V systems, and blown fuses are a common culprit. If a specific item—like the fridge or interior lights—stops working, check the relevant fuse. Replacing a fuse is easy, but if it blows again immediately, that points to a deeper issue such as a short circuit or faulty component.
Don’t be tempted to install a larger fuse as a workaround. Fuses are there to protect your wiring and devices. Using the wrong size can cause overheating or fire.
It’s also a good idea to carry spare fuses of various sizes and a basic multimeter. A quick voltage test can confirm whether power is reaching the fuse block or appliance.
Inspect the Wiring
Vibration, moisture, and age can cause wear and tear on wiring, especially in caravans that travel often or have been stored in the elements. Look for frayed insulation, loose connectors, or wires that have come loose from their terminals.
Areas around water tanks, pumps, and under seats are common trouble spots. Water leaks or rodents can also cause hidden damage that affects your power supply.
Appliances and Accessories
If your battery is healthy and the fuses are intact, a faulty appliance could be the issue. Try unplugging all accessories, then reconnecting them one at a time to identify which one causes a voltage drop or system fault. A faulty fridge or inverter can pull more current than it should, draining the battery or tripping protection devices.
When to Call the Experts
While some issues are easy to fix, electrical faults can be complex—and risky—if not handled correctly. If you’ve gone through the basics and still can’t find the cause, it’s time for a professional inspection.
At AllBrand Caravan Services, we specialise in diagnosing and repairing 12V electrical systems for all types of caravans. Whether it’s a wiring issue, a charging fault, or something more involved, we’ll get you back on the road with confidence.
📞 Call us: 3869 2969
📍 Visit: 101 Connaught Street, Sandgate QLD 4017
📧 Email: info@allbrandcs.com.au
Let us sort your electrical troubles—before they ruin your next getaway.
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