allanb Posted August 11, 2011 Share Posted August 11, 2011 I recently bought a small air pump, designed to be plugged into a car's 12v cigarette-lighter socket. No problems, but I'm puzzled by one thing: the instructions tell me not to use it while the car's engine is running.In my ignorance I would have thought it was quite a good idea to let the engine compensate for the power being taken from the battery. Can anyone explain why it isn't?(It may not be a very efficient use of fuel, but that's a different subject.) Link to comment Share on other sites More sharing options...
Théière Posted August 11, 2011 Share Posted August 11, 2011 Alternator charging can exceed the stated power of the air pump, whereas a constant dc voltage of 11.8 when not being charged by the alternator. Link to comment Share on other sites More sharing options...
nomoss Posted August 11, 2011 Share Posted August 11, 2011 It could be some crazy H&S thing. In case someone puts the car in gear while you're out there pumping up a tyre [:)] Link to comment Share on other sites More sharing options...
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