1993 Mitsubishi Eclipse 4 cyl Front Wheel Drive Manual 160000 miles
I was driving the hwy last week, 65mph. The brake, coolant and battery lights came on, went off, for the duration til I parked (10 min.).
Brakes woke fine, engine temp is fine, replaced alt 3 mos. Ago. Drove it a week later, lights still come on but are dim now.
They all have one thing in common and thats the alternator. I would start by rechecking alternator. I believe the regulator is what powers those dummy lights and when the regulator starts failing thats what will happen. Hope this helps