Caravan Electrics for Busselton and the Capes

This guide is for families and travellers towing a caravan, camper or pop-top from Perth or Bunbury down to Busselton, Dunsborough and the Capes. It follows the drive south, then covers the electrical checks worth doing before you leave, keeping the van battery charged on the way, brakes and breakaway systems, and running power once you've set up camp.

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The drive south

Most caravans heading for the Capes come down Forrest Highway, a dual carriageway with a 110 km/h limit. In WA you can't tow faster than 100 km/h, whatever the sign says. From Bunbury, Bussell Highway is divided as far as Capel, and Main Roads completed the Bussell Highway duplication between Capel and Busselton in April 2025. The Busselton Bypass takes through traffic around the town, and Caves Road heads west to Dunsborough and Cape Naturaliste. South of Vasse, Bussell Highway is a single carriageway with overtaking lanes on the way to Margaret River.

School holidays, long weekends and big events in Busselton bring heavy traffic in both directions. That means more stop-start towing, more time at low speed with the air conditioning on, and more chance of a fault showing up in a queue. A van that's electrically sound before you leave makes the trip far easier.

Checks before you leave home

Do these a few days before departure, not the morning you leave, so there's time to fix anything you find:

• Every light on the van: tail, brake, indicators, side markers and number plate light, checked with a helper.
• The plug and socket on both vehicles: clean pins, no corrosion, and a firm fit.
• The electric brakes: test with the controller's manual slider at low speed in the driveway or street.
• The breakaway battery: fully charged, and the breakaway switch and cable in good condition.
• The van's house battery: fully charged, with tight, clean terminals.
• Fuses and a spare set of globes for the car and the van, packed where you can reach them.

Keeping the van battery charged

Many travellers arrive in Busselton with a flat van battery and a warm fridge, even though they've driven for hours. The cause is usually the charging path from the car. Long, thin cable loses voltage between the car and the van, and many newer vehicles use smart alternators that reduce output once the starting battery is full. The van battery ends up barely charging.

A DC-DC charger in the van or the car, with heavy cable and a good earth, usually solves it. It boosts the voltage to suit the battery and copes with smart alternators. Our guide on why a caravan battery isn't charging while towing explains the checks. Remember that a three-way fridge running on 12V while you drive draws a lot of current, so make sure its supply cable is sized for the job.

Brakes, controllers and breakaways

WA's transport department sets out the brake rules in its Safe Towing bulletin (IB-107). In summary, trailers with a gross trailer mass over 750 kg need brakes. Over 2000 kg, all wheels must be braked, the brakes must be operated from the driver's seat and a breakaway system is required. Many full-size caravans fall into that heavier group. The bulletin also covers towing limits, couplings and safety chains, so read the current version and check your van's compliance plate.

An electric brake controller only works well if it's wired with the right cable and set up for the load. Adjust the gain after loading the van, and again if you add water or gear. Weak braking often comes back to thin wiring, a corroded plug pin or a poor earth. Our guide on how to install an electric brake controller covers the wiring basics.

On the road

Stop every couple of hours and walk around the rig. Feel the hubs for heat, check the plug is still seated and look at the safety chains. If your indicators start flashing fast or a light stops working, find the fault at the next safe stop rather than pushing on. The Road Safety Commission's towing advice also reminds drivers to keep at least 60 m behind heavy vehicles and other towing vehicles unless overtaking, and to use towing mirrors when the load is wider than the car.

If the car's battery warning light comes on while towing, don't ignore it. It can mean the alternator or its belt has failed, and the car is running on battery alone. Turn off non-essential loads and get it checked at the next town.

Power at camp under the trees

Many caravan parks and campgrounds around the Capes have tall trees and shady sites, which feel great in summer but cut solar output. A roof panel that keeps up in full sun may struggle under a thick canopy. A portable panel on a long lead lets you park in the shade and put the panel in the sun. Our guide on how much solar you need for a caravan helps you size a system.

On a powered site, the van's mains charger does the work, but the 240V side of a caravan is for licensed professionals only. If an RCD keeps tripping or a power outlet stops working, use the park's office or an electrician rather than opening anything up yourself.

If something fails down south

Busselton has auto electricians, and some offer mobile service to caravan parks. Peak holiday periods are busy, so call early in the day and describe the fault clearly: what stopped working, when, and what you've checked. Our Busselton page has more local tips. A small kit with fuses, globes, a multimeter and some spare cable and connectors will get you through most minor faults.

When you get home, write down anything that played up on the trip, from a flickering marker light to a slow-charging battery. Fixing those faults in the off-season is cheaper and less stressful than finding them again on the next long weekend.

Parts for this job

Order quality parts online from Ozautoelectrics, dispatched Australia-wide.

Get it done: get a quoteDo it yourself: shop DC-DC chargers

Get it done: get a quoteDo it yourself: shop electric brake controllers

Get it done: get a quoteDo it yourself: shop breakaway kits

Get it done: get a quoteDo it yourself: shop portable solar panels

Questions Bunbury drivers ask

What's the speed limit when towing a caravan in WA?

The maximum is 100 km/h, even on roads like Forrest Highway that are signed at 110 km/h. Lower signed limits still apply. Towing more slowly also gives you more time to react in holiday traffic and reduces load on the car's engine and cooling system. Check the Road Safety Commission's towing advice for current rules.

Does my caravan need a breakaway system?

Under WA's Safe Towing bulletin, trailers with a gross trailer mass over 2000 kg need a breakaway system, along with brakes on all wheels that are operated from the driver's seat. Many full-size caravans fall into this group. Check your van's compliance plate and the current bulletin, and test the breakaway battery before each trip.

Why is my caravan fridge warm when I arrive?

On 12V while driving, a three-way fridge draws a lot of current. Thin cable or a poor earth between the car and the van drops the voltage, so the fridge barely cools. Heavier cable, a dedicated fridge circuit and good earths usually fix it. Have the voltage at the fridge checked while the engine is running.

Will my solar panel work at a shady campsite?

Output falls sharply in shade, even partial shade on part of a panel. Under the tall trees around the Capes, a fixed roof panel may not keep up. A portable panel on a long lead, moved through the day to follow the sun, is often the simplest answer. A larger battery also gives you more buffer.

Need an auto electrician in Bunbury?

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Run an auto electrical business in Caravan Electrics for Busselton and the Capes?

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• Want more local customers? List your business on this site so drivers in Caravan Electrics for Busselton and the Capes can find you.

Not confident doing this yourself?

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