4WD and Caravan Trips from Mackay: Electrical Prep

This guide is for Mackay locals heading off with a 4WD, camper trailer or caravan, whether it's a weekend up the Pioneer Valley or a longer run west or along the Bruce Highway. It covers the electrical setup that matters for the roads out of Mackay, and the Queensland towing rules worth checking before you go.

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Where Mackay trips go

From Mackay, most trips head one of three ways. West up the Pioneer Valley on the Mackay–Eungella Road towards Finch Hatton and Eungella National Park. West inland on the Peak Downs Highway through Walkerston, Eton and Nebo towards Clermont. Or north and south along the Bruce Highway.

Each of these asks different things of your vehicle's electrics. Steep range roads test your trailer brakes and brake controller. Long highway legs test your charging setup. And a few days camped without power tests your batteries and solar.

The Eungella range: brakes and planning

The Mackay–Eungella Road (State Route 64) runs about 70 km from the Peak Downs Highway at Alexandra, through Marian, Mirani and Finch Hatton, to Eungella. The last section climbs the escarpment from Netherdale to Eungella, rising around 490 metres in about 4 km. It's sealed, but it gets narrower, steeper and tighter as it climbs, with some short sections steeper than 15 percent. It's widely described as unsuitable for caravans.

If you're towing a caravan, plan to leave it lower in the valley and drive up without it. If you take a small camper trailer up, make sure its brakes and your brake controller are set up properly before you start, because you'll be relying on them on the way down. A brake controller set too low makes the tow vehicle do all the work, while one set too high can lock the trailer wheels. Our guide on installing an electric brake controller explains how they work and how to adjust them.

Camping inside Eungella National Park itself is limited. Fern Flat campground, for example, can only be reached on foot, so check what suits your setup before you go.

Heading west on the Peak Downs Highway

The Peak Downs Highway runs about 266 km from the Bruce Highway at Mackay to its junction with the Gregory Highway near Clermont. The road over the Eton Range was realigned and upgraded, with the project completed in October 2020. It's still a climb, so the same brake checks apply with a heavy van behind you.

Longer days on the highway are when charging problems show up. If the caravan battery isn't full when you arrive, the cause is usually the wiring between the car and the van, not the battery itself. Our guide on why a caravan battery won't charge while towing goes through the usual causes.

Charging the van or second battery on the move

Many newer 4WDs have smart alternators, which drop their output voltage once the starting battery is full. A simple isolator then can't charge a second battery properly. A DC-DC charger fixes this by boosting and managing the charge to the auxiliary battery, whether that battery lives in the canopy or in the caravan. Our guide on choosing a DC-DC charger or an isolator helps you work out which suits your vehicle.

The cable between the car and the van matters as much as the charger. A long run through thin wire loses voltage, and the charger can't make up for it. Use heavy cable, a good quality Anderson plug at the rear of the vehicle, and fuses at both ends of any run that leaves the battery.

If you plan to camp a few nights without power, work out what you use each day: the fridge, lights, water pump and phone charging. That tells you how much battery and solar you need to stay put. Our guide on how much solar you need for a caravan helps you do the sums.

• Check the alternator type before buying charging gear.
• Size the cable for the full length of the run, car to van.
• Keep Anderson plugs clean and fit dust caps.
• Fuse every circuit close to the battery.

Plugs, lights and tow vehicle wiring

Caravans and campers commonly use a 12-pin flat plug or a 7-pin round plug, and the tow vehicle needs to match. A plug adaptor can get you out of trouble, but a permanent mismatch often leads to missing brake or charging circuits. Before a trip, check every light on the van with a helper, then check the brakes are working with the controller's manual lever before you leave the street.

Dust from gravel roads and campground tracks gets into plugs quickly. Clean the pins, fit a cover when the van is unhitched, and replace plugs with damaged or loose pins rather than bending them back.

Queensland towing rules to check

Transport and Main Roads' Safe towing guide sets out the main requirements. Many caravans are over 2000 kg gross trailer mass, and above that figure the brakes must work on all wheels and be operable from the driver's seat, which in practice means electric brakes and a controller. The trailer also needs a breakaway system that applies the brakes if it comes off the towbar and keeps them on for at least 15 minutes. The guide also notes that extra mirrors may be needed for towing large trailers.

Stay within your vehicle's towing capacity and the towbar's rating, and keep your lights and number plate visible. Rules are updated from time to time, so check current requirements with TMR before a big trip. For road closures and conditions, check QLDTraffic before you set off, especially after heavy rain.

Before you leave Mackay

Get any electrical work done well before the trip, not the day before. That gives you time to use the new setup locally and find any problems while you're still close to home. Auto electricians around Mackay and out through the Pioneer Valley can check your charging, brakes and wiring before you go.

Parts for this job

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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 Anderson plugs

Get it done: get a quoteDo it yourself: shop 12-pin flat trailer plugs

Questions Mackay drivers ask

Can I tow a caravan up the Eungella range?

It's not a good idea. The climb from Netherdale to Eungella on the Mackay–Eungella Road is steep, narrow and has tight bends, and it's widely described as unsuitable for caravans. Most people leave the van lower in the Pioneer Valley and drive up without it. If you take a small camper trailer, make sure its brakes and your brake controller are properly set up first.

Why isn't my caravan battery charging on the drive from Mackay?

Common causes are a smart alternator that drops its voltage, a simple isolator that can't cope with it, thin cable over a long run, or a dirty or damaged plug. A DC-DC charger with heavy cable usually fixes the first three. Check the plug pins and fuses first, as they're the easiest to fix.

Does my caravan need a breakaway system in Queensland?

If the caravan's gross trailer mass is over 2000 kg, TMR's Safe towing guide says the brakes must apply automatically if the trailer becomes detached and stay on for at least 15 minutes. Many caravans are. Check your van's compliance plate for its masses, and check the current rules with Transport and Main Roads.

Should I use a 7-pin or 12-pin plug for my caravan?

Use whatever your caravan is wired for, and match the tow vehicle to it. A 12-pin flat plug has extra pins for things like battery charging and reversing lights, while some vans use a 7-pin round plug with a separate Anderson plug for charging. Adaptors work in a pinch, but a permanent match is more reliable.

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