Mice, Rats and Car Wiring Damage in Adelaide

This guide is for Adelaide drivers, especially on the northern fringe near the Adelaide Plains, whose cars sit in sheds, garages or on rural blocks where mice and rats move in. It covers South Australia's mouse plague history, the signs of rodent damage, how to make your vehicle less inviting and what a proper wiring repair involves.

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Why rodents go for car wiring

A parked car offers a rodent shelter, warmth from a recently run engine and plenty of nesting material in the form of insulation, air filter foam and cabin filter fibres. Mice and rats also need to gnaw constantly to keep their teeth worn down, and wiring, plastic hoses and wiring loom tape are easy targets.

The damage is often out of sight. A mouse can nest in the airbox, behind the dash or along the engine bay loom, chewing through a few wires that only cause trouble days or weeks later. Our national guide to rodent damage to car wiring covers the general picture. This guide adds the South Australian side.

South Australia's mouse plague history

House mice are a long-running problem in South Australia's grain-growing country. Primary Industries and Regions SA (PIRSA) says mouse plagues in South Australia occur every four to six years, and that they cause the most trouble in low-rainfall cereal-growing areas.

Recorded plagues go back well over a century. Historical accounts describe plagues near Saddleworth in 1872, around Balaklava in 1917 and on Eyre Peninsula in 1956, which was described as the worst the area had known. South Australia was also hit in 1994, along with NSW and northern Victoria, and again in early 2011, when plague numbers spread across several states.

In April 2026, CSIRO's forecast showed mouse numbers moderate to high and increasing across the Adelaide Plains and Yorke Peninsula, with high activity also reported in the Mid North and on Eyre Peninsula. Grain Producers SA warned growers to be ready to act at sowing. Check PIRSA's house mouse page for current advice, as conditions change from season to season.

Which Adelaide vehicles are most at risk

When mouse numbers build up on the Adelaide Plains, the northern edge of the city sees them first. Properties around Virginia, Two Wells and the market gardens, and suburbs near open land in Elizabeth, Edinburgh and Salisbury, are closer to the paddocks where mice breed.

Rats are a city-wide issue, not just a rural one. Older suburbs with backyard sheds, compost bins, fruit trees and chook pens can support rat populations right through Adelaide, from the inner west to the southern suburbs.

Across all areas, the vehicles most at risk are the ones that sit still: a second car in a shed, a project car under a cover, a farm ute in a machinery shed, a ride-on mower, or a car left parked for weeks while the owner is away.

Warning signs of rodent damage

Look under the bonnet of any car that has been parked in a shed or garage during a busy mouse season. Common signs include:

• Droppings on the engine cover, battery or in the airbox.
• Shredded paper, grass, leaves or insulation stuffed into corners of the engine bay.
• Chewed plastic covers, hoses or bonnet insulation.
• A musty smell through the air vents, often from a nest in the cabin filter housing.
• New warning lights, a car that won't start, or a sensor fault that appeared after the car sat for a while.
• Intermittent faults that come and go as damaged wires move.

Making your car less inviting

Start with the shed or garage, not the car. Store grain, pet food, bird seed and chook feed in sealed metal or heavy plastic containers. Clean up spilt grain and fallen fruit. Block gaps under doors where you can.

Open the bonnet regularly on cars that sit, and clear out any nesting material. Driving the car every week or so also helps, because rodents prefer places that aren't disturbed.

If you use traps or bait, follow the label exactly and place them where children, pets and native animals can't reach them. Never put bait inside the engine bay, where a poisoned rodent may die inside the car. Deterrent products such as ultrasonic units and repellent sprays are sold widely, but results vary, so treat them as an extra rather than a replacement for cleaning up food and nesting spots.

Fixing chewed wiring properly

Chewed wiring needs a proper repair, not a twist of tape. Each damaged wire should be cut back to clean copper, joined with a suitable crimp or solder joint, sealed with adhesive-lined heat shrink and wrapped or sleeved again. Our guide on how to crimp wire connectors shows the technique.

Sensor wiring needs extra care. Wires for crank and cam sensors, oxygen sensors and data networks are sensitive to poor joints and to twisted pairs being untwisted. Sometimes replacing a section of loom or a whole sub-harness is the more reliable fix.

If you smell burning or see smoke, stop, switch off and get help. Our guide to a burning smell or smoke from car wiring explains what to do. Check fuel and brake lines too, as rodents can chew more than wires.

Insurance and getting help

Some comprehensive car insurance policies cover rodent damage and some exclude it. Read your policy wording and ask your insurer before you book repairs, and take photos of the damage and any nests first.

An auto electrician can trace the damaged circuits, repair them and check fault codes once the wiring is fixed. In the north, see our pages for Elizabeth, Salisbury and Edinburgh, or browse the Inner West and Port for Wingfield and Regency Park.

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Questions Adelaide drivers ask

How often are there mouse plagues in South Australia?

PIRSA says mouse plagues in South Australia occur every four to six years, mainly in low-rainfall cereal-growing areas. Recorded plagues include Balaklava in 1917, Eyre Peninsula in 1956, and statewide outbreaks in 1994 and 2011. In April 2026, CSIRO reported rising numbers on the Adelaide Plains and Yorke Peninsula. Check PIRSA for the current situation.

Does car insurance cover rats or mice chewing my wiring?

It depends on your policy. Some comprehensive policies cover rodent damage, while others exclude damage caused by animals or vermin. Read the product disclosure statement or ask your insurer before repairs start. Take clear photos of the chewed wiring, droppings and any nests, and keep the auto electrician's report and invoice to support a claim.

Can I just tape up a chewed wire?

Tape on its own is not a lasting repair. It lets moisture in, can unwrap with engine heat and leaves a weak joint that may fail later. Cut back to clean copper, make a proper crimped or soldered joint, and seal it with adhesive-lined heat shrink. Sensor and data wiring is especially sensitive, so have an auto electrician repair it if unsure.

How do I keep mice out of a car stored in a shed?

Remove what attracts them: seal up grain, pet food and feed, clean up spills and block gaps under doors. Check the engine bay often and clear any nesting material, and start or drive the car regularly. Use traps or bait strictly by the label, away from children, pets and wildlife, and never put bait inside the car.

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