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Check charging system output. If it is correct then their is something wrong with the gauge light. If the battery is not going dead, then that is most likely. Brake light has nothing to do with the problem.
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You mentioned "alternator warning light" if that alt, battery light does not come on when the key is turned to the "on, acc." position the light bulb is bad or the traces leading to that light bulb on the back of the instrument cluster has a break in it. I know this sounds crazy but if that light bulb does not light it does not complete the circuit for the alt to charge!
The battery and alternator may have been ok. You have a fuse or fuseable link between the alternator and battery to protect it. If you have battery voltage at the battery post and not at the alternator post, there is a break in that circuit. If the battery cable goes to the starter, the alternator wire may go from there and that could be where the fuseable link is. Fuseable links are special thin wires that act like fuses.
Your alternator cant be good if all those dash lights are on then the alternator is bad, reoplace it and make sure the battery is tested, a bad battery can and will destroy a new alternator, also make sure the connections at the rear of the alternator are good, the reason for car dieing in motion is due to the battery draining down and theres not enough voltage to keep ecletrical components going, you must have a bad connection at alternator or alternator is bad. and the last thing to check would be the alt fuse which should be located near the postive battery terminal. good luck.
Break light is no joke have the brake system checked for internal and external leaks . If none are found then itspossibly the brake hand / foot switch.
Battery lite could be incorrect battery or alternator is defective or the wiring behind alternator is corroded and lastly voltage regulator may be defective.
If you have a volt meter, set it to volts and hold the negative probe to the alternator body and the positive to the battery positive. If you don't get battery voltage then the alternator isn't grounded and the probable cause is the main engine ground cable either breaking or coming loose.
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