mikey_172 Car m-tec bmw 325 ci spo Dec 30, 2007 #1 ok when u drive along the head lights brighten up and when you switch more elctrics on they dim down is this the alternator ?
ok when u drive along the head lights brighten up and when you switch more elctrics on they dim down is this the alternator ?
B bmh.01 Car BMW M135i Dec 30, 2007 #2 Or battery, most likely the battery. Change that first anyway.
L Lunner Dec 30, 2007 #3 Most likley earths rather than battery, check these first, its cheaper than a new battery