1990 ford bronco/full size headlight, cab lighting, and sterio shut off

problem is at the switch at the trans, you need to reajusted it

check fuses/broken wire in light holder/bulbs

Bronco uses a RELAY switch under the hood. Is that what you replaced?

Swap it with the A/C RELAY switch (they are the same) to check it.

One of my driving lights went out after hitting a bump on a dirt road, how do I replace the bulb? It's not the headlight, it's the driving light or fog light.

are the dash lights blinking on and off also when this condition happens, or is it just the headlights?

Fuse #1 20amp: Headlight Flash-to-pass; Daytime running lamps ( Canada Only ) OR Fuse # 19 40 amp maxi.; Headlamps.

Check battery cables. Clean and replace bolts that hold them on.

sounds like a ground wire on the front of the engin compartment next to the bat is either not make good conduction . try all gounds . even under the dash ned to be cleaned and tightend

Get under the hood and start shaking the wire harnesses, while you have someone sit in the truck waiting for things to flicker on and off. Chances are good that you have a corroded connection that supplies quite a few gadgets. Also check the terminals coming off the battery, and any smaller wires attached to them. These frequently corrode faster than the larger wires. By the way, shaking the harnesses...is called, " THE WIGGLE TEST". Good luck. Chip

possibly the dimmer switch on the floor? happened on my 91 half ton dims didnt work but brights did and then they cut out altogether. a little water goes a long way