Check these in order
- 1. Engine not running: no alternator input. Start the engine and check voltage at the DC-DC charger input.
- 2. Blown fuse: check every fuse, in the vehicle, inline, at the battery and in the van.
- 3. DC-DC charger fault: check the status lights, input voltage and wiring against the manual.
- 4. Wrong charger settings: set the right battery type (lithium, AGM or gel) on every charger and solar controller.
- 5. Battery issue: check terminals are tight, and test the battery voltage and condition.
- 6. Faulty wiring or earth: look for corroded lugs, loose crimps and poor earth points.
- 7. Too much voltage drop: cable that's too thin or too long stops chargers reaching full voltage.
The one tool you need
A multimeter will find most of these faults in minutes. Measure voltage at the battery, at the charger input and at the charger output, with the engine running and then off.
Gear picks
Bluetooth battery monitor with shunt
- See charge going in and out
- App on your phone
Battery terminal cleaning kit
- Fixes corroded connections
- Includes protector spray
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