Rolls-Royce & Bentley Voltage Regulator 22 Amps — RE10621

Is the battery on your classic Rolls-Royce or Bentley failing to charge, or are you experiencing electrical faults such as dim lights, a flat battery or erratic instrument readings? A faulty voltage regulator is a common cause on these dynamo-equipped heritage models — and part number RE10621 is the correct 22 amp replacement voltage regulator for all Rolls-Royce and Bentley models from 1945 to 1955, and for the Silver Cloud I and Bentley S1 from 1955 to 1959.

The voltage regulator controls the output of the dynamo — the generator fitted to these pre-alternator era cars — ensuring the battery receives the correct charging voltage and preventing overcharging which can damage the battery and electrical components. On these classic models the dynamo and regulator work together as a matched charging system, making correct regulator specification essential.

This is a points-based Lucas-type voltage regulator, rated at 22 amps, and is the correct specification for the dynamo charging systems fitted to these cars. It also cross-references as RE10621P.

Important note on earth polarity: All Rolls-Royce and Bentley models covered by this regulator are positive earth — an important distinction when working on the electrical system of these classic cars. Always confirm your car's earth polarity before carrying out any electrical work or fitting components.

Signs your voltage regulator needs replacing: Battery repeatedly going flat despite regular use, battery warning light illuminated, lights dimming at idle and brightening at speed, battery overcharging and losing electrolyte, instruments reading erratically, or dynamo output not responding correctly to engine speed.

Fitment: Rolls-Royce Silver Wraith — 1945 to 1955, Rolls-Royce Silver Dawn — 1949 to 1955, Rolls-Royce Silver Cloud I — 1955 to 1959, Bentley MkVI — 1946 to 1952, Bentley R Type — 1952 to 1955, Bentley S1 — 1955 to 1959.

Call our classic Rolls-Royce and Bentley specialists at +1 845 595 9822 seven days a week. In stock and ships fast from our New York warehouse.