My truck makes a metal scrubbing sound when taking off in first gear. Also my truck acts like it has no power. its very sluggish. Check engine light is on but only for rear o2 sensor. Also my headlights are brighter in between settings. Its like my brights only look normal when holding in the dimmer switch. When i actually switch from dim to bright it clicks but they look very dim. Ive already checked the ground. Is it the dimmer switch?