I just put the alternator in my car today and the battery light on the dash stays on..its a 2003 ford explorer..i called matt and he said to wire the yellow wire on the harness straight to the positive output on the alternator..i did that and the alternator didnt even turn on my batterys were at 12.5..so i put it back the other way ..im getting 14.3 should i not worry bout the batt light on the dash? or should i get another alternator?