Latly I have relised that when I have my indicator on the whole dash board light, radio light, interior light start to dim on and off (to the rythem of the indicator). What I mean is that when the indicator flashes on the lights dim, when it turns off the lights go bright again (This also happens even if the engine is at high revs). It's alomost like theres not enough electricity to go around, what could this be from?? (I measured the battery while the cars on it's 12.5 volts).