AO Silver Member
Join Date: Mar 2003
Its to be expected I believe, either with the engine speed at idle or with the engine off, less so if the alternator is charging at say over 1000 rpm.
The battery voltage will be reduced by adding any any extra load on it. Both headlights and electric windows are high current users. So without the alternator charging the lights will dim and the windows will be slow to go up.
Its possible the battery is also past its best. To get an idea check the sound of the starter motor to see if it is struggling to turn over in cold weather. Is it making a slow whirring noise or does it turn over fairly fast?
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