Grain Harvest and Road Train Electrics Around Geraldton

This guide is for Mid West farmers, carriers and truck drivers getting ready for the grain harvest around Geraldton. It covers pre-season electrical checks on trucks, trailers and farm utes, the faults that tend to show up in the busy months, and why electrical faults matter for fire risk.

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Harvest traffic into Geraldton

Grain is one of the Port of Geraldton's main exports, alongside iron ore and mineral sands. In the harvest months, trucks come in from farms across the Mid West, along roads like Geraldton–Mount Magnet Road, which is regularly used by grain and mine road trains, as well as Brand Highway and Midlands Road from the south. Some head for the port, and some deliver to the grain receival point in the Narngulu industrial area.

For a few busy months, trucks and trailers that might have done little since last season suddenly run long days, often starting before dawn and finishing after dark. That's exactly when electrical faults show up, and a truck stuck with no lights or no start can hold up a whole operation.

Start with a pre-season check

The best time to find faults is before the first load, not in a queue at the receival point. Pick a day a few weeks before harvest, get two people, and go through every truck and trailer systematically. One person works the switches in the cab while the other walks around and notes what's working.

Check brake lights first, then indicators, tail and marker lights, reversing lights, work lights and beacons. Write every fault down in one list before you start fixing anything. Several dead lights on one side of a trailer often share a single broken earth or a damaged plug, and seeing the whole pattern saves time.

• Inspect trailer plugs and sockets for dust, corrosion, bent pins and cracked housings.
• Follow the wiring along each trailer, looking for chafing where it passes chassis rails and crossmembers.
• Test batteries properly, rather than assuming they're fine because the truck started.
• Check alternator output with all the lights on.
• Look for chewed wires, nests and droppings in engine bays and around looms.

Mice and stored machinery

Machinery and trucks that sit in sheds over winter are an easy target for mice and rats, especially in farming areas where there's grain around. Rodents nest in warm, sheltered spots like engine bays and behind trim, and they chew through wiring insulation. The damage is often hidden until a light or sensor stops working, or worse, until two bare wires touch and short.

Before harvest, look carefully at wiring in any vehicle that has been stored. Clear out nesting material, which is a fire risk on its own once things heat up. Repair chewed wires properly with crimped joins and heat shrink, not tape. Our guide to rodent damage to car wiring explains what to look for and how to reduce the chances of it happening again.

Electrical faults and fire risk

Harvest happens in hot, dry weather, with stubble and dry grass everywhere. A chafed cable that shorts to the chassis, an overloaded circuit or a poor connection that heats up can start a fire. On a farm or a roadside verge, that can spread fast. Correct fusing close to the power source, good cable clamping and sound connections all reduce the risk.

Fire bans also affect what you can do. According to DFES, Total Fire Bans are declared on days when fires are most likely to threaten lives and property, and you can view declared bans on the Emergency WA website. Local governments can also issue a Harvest and Vehicle Movement Ban, which limits the use of engines, vehicles, plant and machinery during high fire-risk conditions. These are issued by your local government, such as the City of Greater Geraldton or the Shire of Irwin, not through Emergency WA, so check with your shire. Bans can also restrict activities like welding and grinding, which matters if you planned to do repairs in the paddock. Rules change, so check the current rules before you start work each day.

24V systems on trucks and road trains

Most heavy trucks run 24V electrics, often with two 12V batteries in series. That has a few practical effects. Globes, relays and accessories must be rated for 24V. Fitting a 12V part can cause it to fail quickly or overheat. When batteries are replaced, both should usually be done together, because a new battery paired with an old one tends to wear out sooner.

Multi-trailer combinations multiply the number of plugs, sockets and connections between the prime mover and the last trailer. Every one of those is a place where dust, water or vibration can cause a fault. Keeping plugs clean, using covers on unused sockets and supporting cables so they don't drag or stretch around corners all help.

Charging and starting in the busy months

Long days with lights, beacons, two-way radios and air conditioning running put the charging system under constant load. A weak alternator might keep up during the day but fall behind at night when the lights come on. Signs include dim lights at idle, a battery warning light, or batteries that are slow to crank the next morning. Our guide on how to tell if your alternator needs replacing covers the checks.

Starting problems on hot days are common too. Heat affects battery life, and heavy cables with corroded or loose lugs add resistance just when the starter needs full current. Check that cables and lugs are tight and clean, especially the earth between the engine and the chassis.

Farm utes and support vehicles

Behind the trucks, farm utes do a lot of running around at harvest: carrying fuel, parts and people between paddocks and town. They often carry UHF radios, beacons, work lights and sometimes a fuel transfer pump. Each of these needs its own fused circuit with cable sized for the load. Our guide to what size cable you need helps you get it right.

If you need help before the season, the Geraldton area page lists auto electricians who work on trucks, farm vehicles and machinery. Book early, because many get busy as harvest approaches.

Parts for this job

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Questions Geraldton drivers ask

What's the difference between a Total Fire Ban and a Harvest and Vehicle Movement Ban?

In WA, DFES declares Total Fire Bans on the days when fires are most likely to threaten lives and property, and declared bans appear on the Emergency WA website. Harvest and Vehicle Movement Bans are issued by your local government and limit the use of engines, vehicles and machinery in high fire-risk conditions. Check both, and the current rules, before you start each day.

Why do my trailer lights work at the start of the day and fail later?

Heat, vibration and dust can all make a poor connection fail as the day goes on. A plug that's loose or dirty might work when cold and lose contact once it warms up or the trailer has been shaken on rough roads. Clean and check the plug and socket, the earth connections and any joins along the trailer wiring.

Can I use 12V globes on a 24V truck?

No. A 12V globe on a 24V system will fail very quickly and can overheat. Always use globes, relays and accessories rated for your vehicle's voltage. Some LED lights are rated for both 12V and 24V, which can simplify spares, but check the rating printed on the light or its packaging before fitting.

How can I stop mice chewing my truck's wiring?

Keep sheds tidy and grain spills cleaned up, check stored vehicles regularly and clear out any nesting material. Some people use traps or deterrents around stored machinery. Starting stored vehicles and moving them now and then also helps. If you find chewed wires, repair them properly rather than taping them.

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