Get a test light and find where you are loosing voltage.
check fuses and relays and flasher and go from there
not fuses or relay?
You can view the 1999 Ford Ranger owners manual online at : www . motorcraft service . com ( no spaces ) Click on Owner Information ( the fuses and relays section starts on page 134 )
The year, make and model would help but, check the fuses, the bulbs, the flasher relays and last but not least, the switch.
Check fuses and relays
The signals and the emergency flashers have separate circuits, separate fuses, separate flasher relays. Start with checking the fuses, the bulbs, the signal flasher relay and wiring and if it still doesn't work it may be the signal switch is bad.
Might be turn signal flasher
All fuses and relays are in the underhood fuse box.All fuses and relays are in the underhood fuse box.
All fuses and relays are under the hood, next to the battery.All fuses and relays are under the hood, next to the battery.
check your flasher box, you should hear it click on and off when you turn them on, if not replace it. Check the fuses and flasher relays also.
You can view the 2002 Ford Ranger owners manual online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides The fuses and relays section starts on ( page 197 )
Main fuses and relays are in PD box next to battery. Interior fuses are in a box under dash, left side of steering column.