Power drain from blower fan?
So I'm on the freeway the other night doing about 70 so the engine is at about 2700ish. I had my radio playing like normal(only 250 watts and bass is not up) and the lights on. It gets a bit warm so I turn the vent on. The fan just happened to be on high and I noticed that when it turned on the headlights dimmed for a split second. Maybe its nothing but to me I'm not drawing enough current with the stereo and headlights for the headlight to dim when I turn the fan on from a dead stop especially when the engine is revving so high. The battery is a Red Top Optima about 2 years old. Anyone think the alternator is on its way out? I have read that the voltage gauge is just an idiot light in disguise but it reads lower than it did when I first bought the truck 4 years ago. Ideas?
2010 MGM Taco Dbl Cab TRD offroad 4wd
*atrocity loves Toyota more than me but no i dont like the jealous tool*