If you "reinstalled" the battery, that implies you removed it for testing off the vehicle. To do that it had to be recharged first for the tests to be accurate. That's why the engine started normally when you put it back in. It's the charging system that needs to be tested. From your description, it is letting the battery run down while you're driving. You should have seen that by the "Volts" gauge dropping on the dash. Head lights would gradually become dim, the heater fan would slow down, and power windows would slow down. Computers will start to do weird things too including causing improper operation of lights. Have the charging system load-tested and repaired before searching for the causes of other problems that may not exist.
Wednesday, January 9th, 2013 AT 9:18 PM