Last year on my 02 everything, dash, radio, headlights they all started going dim, the radio started having some excessive noise in it as well. I thought the Alt. was going bad, tore it apart and found a lose wire on the alt, started getting some corrosion on it, causing it to not be able to recharge the battery. Removed and cleaned and put a new batt in (was due for a batt anyway) problem solved.