One Light wont pop up on my 1990 Mx5

Try adding water absorb ant fluidd, ie heat. To fuel. May have condensed water in tank. Popped a fuse or breaker

check the motor that pops up the light

If you want to solve your problem, click on the link I attached 1990 nissan 240sx

There's a 30-amp fuse for the headlamps - check that first. Under the hood on the passenger side. Right next to it is a relay that drives the headlights.

Have it checked out by a professional body shop. If they determine the problem is related to a covered accident, then they can typically get it approved by an insurance adjuster.

check fuses

You know whats connected to the fuse, now start systematically disconnect each component and each time you try the fuse same fault, reconnect, till you ge t to the component which you disconnect and do not blow the fuse, now you know it is in that component start tracing the wires/bulb connections. , have 10 spare fuses ready'

Try to check if there is something stuck to the motor of the pop-up lights mechanism. You can see it below the fenders. The fender liner should be removed.

check globe ,wiggle wires,check fuse clean light housing

check the fuse first if the fuse is good and both head lights won't go down check if the head light switch in the middle of the dash is good