one of the lights is not working
That usually means one or more of the bulbs is not working. Check for bad bulbs or bad ground wire or socket.
how many mpg does a 1997 chevy blazer get?
Look from the outside. Either the front or back bulb is burned out.
One of the bulbs is burned out. Turn on the blinker and look at the front and back turn signals to find out which one.
You probably have a bulb going bad. The filament in the bulb is broken and sometimes it makes contact and sometimes it doesn't.
Check to make sure all bulbs are flashing could be a bad turn signal flasher
That's probably because that's the older van and the more original blinkers
bulbs are to small Check the fuses.
Turn signal flasher
The problem could be in you flasher located on the fuse block . or the multifunction switch located on the steering column.
Could just be bad bulbs. When the bulbs go bad, even if only one side of a two lighted bulb, they blink fast. That or the flasher relay.
Some of the older cars would blink fast when one of the signals on the front or back on the same side would burn out but i don't know about both of them blinking fast. You might see if you have a coulple of signals out. It might just be a corroded contact on the bulbs.