HELLA5DR 004 241-121Art. 5DR 004 241-121£20.99
OEM & aftermarket alternator regulator from top brands — compare prices, check fitment, order with free delivery
Shop 5015 alternator regulator from 24 trusted brands including AS-PL, HC-Cargo, BOSCH. Compare prices, check vehicle compatibility, and get free delivery on orders over £99.
The voltage regulator controls the alternator's output to maintain a stable 13.5-14.5V charge to the battery and electrical system. A faulty regulator causes overcharging (which damages the battery and electronics) or undercharging (which drains the battery). On many modern vehicles, the regulator is built into the alternator.
Voltage regulator problems affect the entire electrical system. Both overcharging and undercharging cause distinct symptoms.
Test the charging voltage at the battery terminals with the engine running. A reading outside 13.5-14.5V indicates a regulator or alternator fault.
Commonly searched OE numbers fitting Alternator Regulator from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.
