Farm Ute and 4WD Electrics on the Atherton Tablelands

This guide is for growers, farmhands and contractors running utes and 4WDs on the Tablelands, from the dry country around Mareeba and Dimbulah to the wetter farms near Atherton and Malanda. It covers the electrical problems farm vehicles pick up up here, how to wire accessories so they last, and the rules to check before you bolt on more lights.

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Two climates on one tableland

The Tablelands aren't one climate. A 2015 Tablelands agricultural profile lists average annual rainfall of about 1420 mm at Atherton and 1565 mm at Malanda, but only around 918 mm at Mareeba and 783 mm at Dimbulah. It describes the eastern and southern areas as wetter and cooler, and the west and north as hotter and drier.

That split shows up in farm vehicles. Utes working the drier western country around Mareeba spend much of the year in dust. Vehicles on the wetter eastern side deal with more mud, damp sheds and wet paddocks. Many farm utes see both, along with a regular run down the range to Cairns.

What Tablelands farm vehicles do all day

The farming mix is wide. The Mareeba Heritage Centre's guide to farming in the shire lists avocados, mangoes, bananas, coffee, sugar cane, potatoes, citrus, lychees and much more, and the Mareeba–Dimbulah irrigation scheme supplies water from Tinaroo Dam through a network of channels. Around Atherton, maize and peanuts have long been grown, and dairying is centred on the Malanda and Yungaburra districts. Beef cattle are the main land use further west.

For a farm ute, that means short trips between blocks, long hours at low speed, plenty of stopping and starting, and accessories that run with the engine off: spray units, pumps, two-way radios, work lights and beacons. That pattern is hard on batteries and on wiring that was added in a hurry.

Dust, red mud and water

Fine dust packs into plugs, switches and the back of fuse boxes, and it gets drawn into alternators. Over time it can hold moisture against terminals and cause intermittent faults. On the wetter side, red mud cakes around wiring under the tray and in wheel arches, and pressure washing it off can drive water straight into connectors.

When you wash a farm ute, keep the high-pressure nozzle off plugs, relays and the alternator. Use sealed connectors and relays for any accessory wiring under the tray or chassis, and fit dust caps to Anderson plugs and trailer sockets. If a fault comes and goes with the weather, a dirty or damp connector is the first place to look.

Rats, sheds and idle seasons

Machinery sheds, grain, feed and harvest leftovers attract rats and mice, and rodents like to chew wiring. Farm utes and 4WDs that sit in a shed for a few weeks between jobs are easy targets. Our guide to rodent damage to car wiring covers prevention and what to look for.

Vehicles that only work in certain seasons also suffer from flat batteries. A modern ute's computers and alarm draw a small current all the time, and a few weeks of sitting can leave the battery too low to start. A smart maintainer on a power point in the shed, or a solar maintainer for a vehicle parked out in a paddock, helps. Our guide on why a car battery keeps going flat explains how to check for a larger drain.

Powering farm accessories properly

A 12V spray unit, transfer pump or fridge can draw a lot of current, often with the engine off. Running those from the starting battery is a common cause of a ute that won't start at the end of a job. A dual battery system keeps a reserve for starting. Our guide on how a dual battery system works explains the setup.

Run heavy accessories through a relay and a correctly sized fuse close to the battery, with cable sized for the current and the length of the run. Our guide on wiring a 12V relay shows how. Use Anderson plugs for accessories that come on and off the tray, so you are not cutting into the loom every time.

• Clamp cable runs along the chassis and use grommets where cable passes through metal.
• Keep wiring away from exhausts, moving suspension and anything a branch or stake could catch.
• Label switches and fuses, so anyone driving the ute knows what each one does.
• Check terminals and earth points after a season of rough paddock work.

Light bars, work lights and beacons

Extra lighting is useful for early starts and late finishes, but Queensland has rules on lights fitted to registered vehicles. Transport and Main Roads publishes a vehicle standards information sheet on driving lamps, including LED light bars, plus sheets on front fog lamps and on additional lighting. They cover things like how many driving lamps you can fit, where they can be mounted and how they must be wired. You'll find them on the TMR vehicle standards information page.

Work lamps used around the farm are a different thing from driving lamps used on the road, and the rules treat them differently. Warning beacons are also controlled. If you are not sure whether your setup is legal for driving on public roads, check the current TMR rules or ask a qualified auto electrician before you fit it.

Up and down the range

Most farm vehicles head to Cairns now and then, and both main routes are demanding. The Gillies Highway climbs from Gordonvale towards Yungaburra with about 60 curves in 15 km, and the Kuranda Range Road runs from Smithfield up through Kuranda towards Mareeba. Long climbs with a load on or a trailer behind put the cooling fan, alternator and brakes to work, so it pays to have the charging system checked if warning lights flicker on the climb.

If you tow farm trailers on public roads, the trailer lights must work and heavier trailers need brakes. The Queensland Government's towing vehicles and trailers page is the place to check the current rules. For repairs, mobile auto electricians cover Mareeba and Atherton, and can often come out to the farm.

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Questions Cairns drivers ask

Can I fit an LED light bar to my farm ute in Queensland?

Usually yes, but there are rules on the number of driving lamps, where they are mounted and how they are wired. Transport and Main Roads publishes an information sheet on driving lamps, including LED light bars. Read the current version before fitting one, and ask a qualified auto electrician if you are unsure whether your setup complies.

Why does my farm ute battery go flat between seasons?

Modern vehicles draw a small current all the time for their computers, alarm and clock. Over several weeks of sitting in a shed, that can drain a battery too far to start the engine. A smart maintainer, or a solar maintainer for a vehicle parked away from power, helps. If it goes flat in a few days, have the vehicle checked for a larger drain.

How should I wire a 12V spray unit on my ute?

Run it from a dedicated circuit with a relay and a fuse close to the battery, using cable sized for the pump's current and the length of the run. If you'll use it with the engine off, a dual battery system stops it flattening your starting battery. An Anderson plug makes it easy to take the unit off the tray.

What causes intermittent electrical faults on Tablelands farm vehicles?

The usual suspects are dust or moisture in connectors, loose earth points after rough paddock work, rodent damage, and water forced into plugs by pressure washing. Start by checking earths and battery terminals, then look for chewed wires and dirty or corroded plugs. A multimeter helps track down where voltage is being lost.

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