Sometimes, as I drive down the highway, my rpms will vary greatly. this is while I am driving on a flat surface at a consistent speed. But at the same time, sometimes the lights get dimmer and the heater fan fluctuates in speed. Is this my alternator causing these issues? Sometimes only the problem is the fanspeed fluctuating, but the rmps are maintaining. When the lights dim, it feels as if I am applying the brakes as I am trying to go faster.
Jan 14, 2010 at 10:28 PM