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Old 19th July 2015, 18:06
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Horns you can ignore as hopefully they are not on often.
Fans vary but 10amps is agood allowance. But again it should be on infrequently so you can probably ignore.
Fuel pumps. 3amps or less for the lp. 5ish for the Hp.
Engine that is ecu injectors and coil -bit of a guess but arround 7amps.

A 60 amp alternator should be more than adequate. The big consumers are the headlights specially if you have additional driving lights and use the bmw system of both main and dipped on together.

Cheers Robin
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