[Oldsguy]

have your alternator checked to see if it is really charging. Your car doesn't run off the alternator, it runs off the battery which is a voltage storage device, your alternator re-charges the battery at a rate which is supposed to be faster than what the car can discharge the battery UNDER NORMAL CIRCUMSTANCES. If you have faulty wiring or a faulty alternator then it will not work as it was designed to. Pulling the interior lights fuse only proves that the dome light is not the problem. Besides, as texasred said the dome light will be on when the door is open and you probably had the door open when you did the test of pulling the fuse out while monitoring your test lite between the neg battery cable and the negative battery post. If your alternator tests good in the car then your friends might be right about the starter but that would be a problem with your ignition switch/circuit because it is supposed to turn the ignition circuit off when the key is out. Your starter is part of that circuit and it would be possible to drain your battery that way. Finally, is your battery new? Have you fully charged it on a slow charger over night? You might have a bad battery. In retrospect, you should check that first, then the alternator, then the ignition circuit.