There is a relay switch for the signal flasher's, on your 1997 Ford van. The relay switch is below the dashboard on the drivers side.
The turn signals on a 91 caprice do not work, the emergency flashers do.
Its the 1x3/4 inch silver round fuse in the fuse box
where is the turn single flashers on a 2008 f450
Replace the Flasher Relay.
Same flasher for left and right signals but a different flasher for the emergency flashers.
Probably a wiring issue between the turn signal and the lights.
You may have a relay problem your flashers and turn signal are on different relays or there could be a problem with the wiring in the steering column that goes to the turn signal
The emergency flashers and the signal lights are separate systems. Each has it's own fuse, switch and flasher relay. If your turn signals light up but don't blink I would blame the signal flasher relay.
check the turn signal relay in the steering colum, just before the turn signal switch the plastic receptors may be broke.
http://www.audiforums.com/m_146946/tm.htm
I assume you mean the turn signal/hazard flasher. it is actually a relay located in the steering wheel assembly, next to the turn signal wand. Remove the screws on the underside of the steering wheel cover to access the relay.
Because the hazard/turn signal relay has failed. A defective/intermittent turn signal switch can also cause this symptom.