Caravan Auto Electrical Repairs Gladstone & Calliope

Total Mobile Mechanical Services provides caravan auto electrical repairs and 12-volt fault diagnosis across Gladstone, Calliope and surrounding Central Queensland areas.

We diagnose suitable low-voltage electrical faults in caravans, camper trailers, motorhomes, recreational vehicles and tow vehicles. Our ability to test the caravan and towing vehicle together is important because charging, lighting, braking and connection faults may originate on either side.

This page is focused on repairing and diagnosing existing faults. Planned solar, lithium battery and off-grid power upgrades are covered separately through our dedicated upgrade service.

Call 0456 765 135

Book auto electrical repairs or fault diagnosis.

Caravan 12V Electrical Fault Diagnosis

Caravan electrical faults can be difficult to identify because voltage may appear normal when the circuit is unloaded and then collapse when lights, pumps, refrigeration supply, charging equipment or other accessories are operating.

Diagnosis may include:

Voltage testing
Voltage-drop testing under load
Current-draw testing
Earth-circuit testing
Battery condition and charging checks
Fuse and circuit-breaker inspection
Cable and terminal inspection
Connector temperature and resistance checks
Testing with the caravan connected to the tow vehicle

Testing the system before replacing parts reduces the risk of fitting a new battery, charger or controller while leaving the underlying wiring fault unresolved.

Caravan Battery Not Charging

A caravan battery that will not charge may be affected by:

A failed or unsuitable battery
Battery-management-system protection
A DC-DC charger fault
Incorrect charger settings
Low tow-vehicle input voltage
Smart-alternator behaviour
Undersized wiring
Poor earth connections
Damaged Anderson plugs
Blown fuses or circuit breakers
Solar-regulator or panel faults
Excessive electrical load

We test the battery, charging sources, wiring and connections as a system rather than assuming the battery itself is the only problem.

Anderson Plugs & Tow-Vehicle Charging Faults

Anderson plugs and high-current towing circuits operate in exposed conditions and may be affected by corrosion, loose terminals, heat, dirt, damaged cable and repeated connection.

We can diagnose suitable faults involving:

Hot or melted Anderson plugs
Charging voltage not reaching the caravan
Incorrect cable sizing
Damaged plugs and terminals
Poor vehicle or caravan earths
Fuse and circuit-breaker problems
DC-DC charger supply faults
Intermittent charging while travelling

Starting, alternator and general tow-vehicle wiring concerns are also covered through STARTING, CHARGING & WIRING REPAIRS.

Trailer Plugs, Road Lights & Wiring Repairs

We diagnose and repair suitable automotive electrical faults involving:

7-pin and 12-pin trailer plugs
Indicators and brake lights
Tail, clearance and marker lights
Reverse-light circuits
Trailer earth faults
Corroded connectors
Damaged or poorly repaired wiring
Reversing-camera connections
Electronic stability-control power supplies
Auxiliary and refrigerator supply circuits

Intermittent light faults should be tested with the caravan connected because the problem may be in the tow vehicle socket, caravan plug, earth circuit or wiring between them.

Electric Brakes, Brake Controllers & Breakaway Wiring

Electric-brake faults may involve the mechanical brake assembly, magnets, wiring, trailer connections, brake controller or breakaway equipment.

Auto electrical diagnosis may cover:

Brake controllers not detecting the caravan
Weak or inconsistent brake response
Brake-output wiring
Trailer-plug brake circuits
Brake magnet wiring
Poor earths and voltage drop
Breakaway battery charging
Breakaway switch and wiring faults

Mechanical brake, hub and bearing repairs are available through CARAVAN MECHANICAL REPAIRS.

Caravan Battery Drain & Intermittent Electrical Faults

A battery that repeatedly goes flat may be caused by an electrical load remaining active, a battery fault, incorrect charging, wiring damage or a device that does not enter standby correctly.

Depending on access and the fault, testing may include:

Battery condition
Key-off current draw
Individual circuit isolation
Charging performance
Battery monitor accuracy
Low-voltage cut-out operation
Visible heat or connection damage
Intermittent faults under vibration or load

Solar & DC-DC Charging Faults

We can diagnose suitable faults in existing solar and DC charging systems, including low solar output, charger shutdown, voltage drop, wiring faults, poor connections and battery incompatibility.

Customers wanting additional panels, lithium batteries, new chargers, battery monitoring or a complete off-grid upgrade should visit CARAVAN SOLAR, LITHIUM & 12V UPGRADES.

Keeping repair and upgrade intent separate makes it clear whether you need an existing fault fixed or a larger system designed.

Caravan & Tow Vehicle Tested Together

A charging or braking complaint may involve the tow vehicle’s alternator, starter battery, smart-charging system, cable size, brake controller, trailer socket or earth connection.

Testing both the caravan and tow vehicle helps identify where voltage or signal is being lost and prevents unnecessary parts replacement.

We can also inspect connected mechanical concerns through our CARAVAN & RV SERVICES hub.

Low-Voltage & 240V Work Boundaries

Our caravan auto electrical work is focused on suitable automotive-style low-voltage systems.

Fixed household-style 240-volt wiring, mains switchboards, fixed power points and other regulated electrical work must be completed by an appropriately licensed electrical contractor.

Gas appliance repairs also require the appropriate licensed or specialist trade. We may diagnose the suitable 12-volt supply side where relevant.

Related Caravan & RV Services

Frequently Asked Questions

Do you have a caravan electrician in Gladstone?

We provide qualified automotive electrical diagnosis and repairs for suitable caravan, camper-trailer, motorhome and tow-vehicle low-voltage systems across Gladstone and Calliope.

Why is my caravan battery not charging while towing?

Possible causes include the battery, DC-DC charger, alternator behaviour, cable sizing, plugs, fuses, circuit breakers, earth connections or incorrect settings. Testing is required to identify the cause.

Can you repair caravan trailer plugs and road lights?

Yes. We diagnose and repair suitable trailer-plug, indicator, brake-light, clearance-light, earth and related wiring faults.

Do you repair electric-brake wiring?

Yes. We diagnose suitable brake-controller, trailer-plug, magnet, breakaway and brake-output wiring faults.

Can you diagnose solar charging faults?

Yes. We diagnose suitable faults involving panels, regulators, DC-DC chargers, wiring, connections, batteries and voltage drop.

Do you install lithium batteries and solar systems?

Suitable planned upgrades are available through our dedicated Caravan Solar, Lithium & 12V service.

Do you repair fixed 240V caravan wiring?

No claim is made for fixed 240-volt electrical work under this automotive electrical service. That work requires the appropriate licensed electrical contractor.