In order to ensure engine starting even after a vehicle has been left for extended periods with electrical loads energised, a vehicle electrical system has two batteries, one (2) dedicated to a first set of loads (3) including those which may be switched on when the engine is not running, and the other (5) connected to the engine starting system (6). A device (4) prevents discharge of the other battery (5) through the first set of loads (3) while permitting the battery (5) to be charged by the generator (1) when the engine is running. The device (4) may be a rectifier or a switch operated by the engine. IMAGE
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