I have a 2000 outback and have an electrical issue. driving with the lights on, every so often they seem to brighten for a moment( probably how they should be), the instrument panel brightens and the ABS light, and battery light flash on, also when i run the heater fan on high it the warning lights flash sometime on. it doesnt seem to be affected by bumps in the road. any thoughts on how to fix? i was thinking an alternator or connection somewhere loose. thanks for your help.