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lights during idling


cornacum
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Hi all

I realized that my car's interior lights and head lights brighten up when I push the accelerator pedal while the car is stationary and idling? The lights then dim down again when revs drop down to idle.

Is this normal, or should I be looking into this?

Thanks

 

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Normal and quite handy as it helps check your alternator works. If lights go brighter when you raise it above tickover it proves your alternator is pushing out a higher voltage than the battery does. 

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But if someone has a car where the lights don’t go brighter it does not necessarily mean that alternator is not working. On some modern cars the alternators have such high output they can give a high output even at tickover speed. 

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