Yesterday I got my Alternator changed to bigger amperage probably of 90 amps everything works fine. When I reached home and try to vheck alternator voltage I found It was showing 15.5 volts with no load applied then I put full load it i.e AC, headlights on High beam and sound system it came down to 14.5 volts. One Issue I have noticed is when use power windows which I have Installed of after market shows batter sign when It closed all they up or all the way down it happens only with two[(driver and passenger(relay installed)] power windows battery sign is coming up. Nothing is showing up with rear ones. I want to ask what's wrong with alternator kindly experienced people help me out. @Xulfiqar help me sir.