Hi I have recently bought a 1990 sportrak EL which was fine until other day driving at night when battery power died and would not start. Went out next morning and battery meter was up and car started but ever since then battery gets drained and needs jump started. Took to my local garage who said it does not sound like alternator and to try new battery which I have. Now car starts but volt meter sits very low just in the white and when use lights or windows goes down then back up when switch lights off or stop window. So am confused as to what problem is any help please???

regards

Steve