I just replaced my battery connectors this morning on my truck. The ends were corroded and powdery. I purchased some replacement connectors but had to strip the other wires that connected on the Pos + side. They all were connected via stock connector that was covered in battery goo as well. I suppose that if one of those wires on the positive side was corroded badly enough, not enough power would get through it. If that's not it, try taking your vehicle to an AutoZone or other place that can test your alternator and battery for free. That at least would narrow everything down. Just a few thoughts that I hope can help...
