1989 Mitsubishi Mighty Max Base 4 Cyl 2.60L
Lights dim and brighten while engine runs
The headlights and all other lights dim and brighten whether its in park or drive.the belts squeak when this happens as well
First step - check the battery connections and terminals, both at the battery and at the opposite ends of each positive and negative cable. Should be clean and tight, with no corrosion.