The tail light bulb is the bottom one and is a 1157 that has two elements. One element can still operate for the signal but the tail element is broken. Replace this bulb with a new 1157. Fuses don't control left or right, they control both together. Fuse goes, both go. Check pigtail for corrosion (white looking powdery substance) and clean it if needed, and check for voltage at the pigtail. If no voltage, trace wiring from bad light socket, toward fuse box, checking every few feet, for voltage, until you get a good voltage reading. From that point, back to the tail light socket, the wire needs to be replaced. Don't forget to check the ground, also.
There are a couple of reasons why the turn signals will not work on a 1998 Ford Explorer. The light bulbs may need replaced or a fuse has blown.
Depends on what type and quality of light bulbs.
Replace the signal flasher relay.
Bulbs can be replaced you have to get bulbs type 9006 (hb4)
check you light bulbs
One of the bulbs are broken, check all of your turn signals.
I just had the same problem and found that my rear turn light bulb went out and the turn signals no longer worked. Check any of the turning bulbs. You may have replaced the hazerd light flasher. There are two flashers, the turn signal one is near the hazerd one under the dash.
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have you check all the bulbs? if one of the bulbs are bad they will light up, but will not blink.
It might be that one of the dual filament light bulbs in the system have had the 2 filaments short out with each other. Usually this also causes problems with the stop signals,and turn signals also. I had this happen on a car a long time ago,after I had already replaced the switch. Always check the bulbs first.
Have you checked the bulbs themselves? The directional signal should be the same element as the brake light. Check to see if you rear directional signals.
I believe on that model you can access the signals by lifting up the trunk carpet and then unscrewing the plastic wing nuts. The light assembly can then be removed for easy access to the bulbs.