Measure the circuit
New battery.
Same problem?
Straight answers about battery drains, charging faults, modules that stay awake and electrical problems that appear only when it rains.
Start with the pattern
When does the fault
actually happen?
Choose the situation closest to yours. These guides explain why electrical faults need measuring over time and why another battery is not always the answer.
Battery goes flat overnight
Common reasons a car battery goes flat overnight and how measured auto-electrical testing separates battery, charging and parasitic-drain faults.
How parasitic drain testing works
How technicians measure sleep current, monitor intermittent wake-ups and isolate the circuit responsible for a parasitic car-battery drain.
Vehicle modules not going to sleep
Why a control module or vehicle network can remain awake after locking the car and cause an intermittent or overnight battery drain.
Battery, alternator or wiring fault?
How load, charging, voltage-drop and current tests distinguish a weak battery from alternator, cable, earth and control-system faults.
Electrical faults after rain
Why warning lights, non-starts and electrical problems can appear after rain, and how water paths, corrosion and affected circuits are investigated.
Battery flat again?