Sometimes when using the turn signals it will get stuck
in the on position. The left turn light on the dash stays
on and the outside of the car shows the left turn lights lit.
This would seem to me like a text book relay failure (but I
could be wrong). Could someone tell me where this relay is?
If possible its part number also.

Thanks a bunch,
Jon
--
-J- 91' 744 at 151000miles

Mine does the same thing now and then.
In fact the right one stays on as well if I am signalling for a right turn.
The 4-way flasher does not work either. Sticks on.
I do not see a separate relay in the wiring diagram.
I believe it is contained in the 4-way flasher button on the dash.
Turning the ignition off and later back on allows it to work again.
I do not think it has anything to do with bulbs or contacts.
Good luck.

-- S'V'

As a real quick check, pull all your turn signal bulbs and make sure the contacts are not mashed together. If one of them shorts out, it will cause some strange problems with the signal lights.
--
97 S90 with 184K miles still going strong

It was rainy today so I didnt spend much time
outside with the car. With the washing fluid
tank in the way of the turn signal bulb it looks
like a nightmare in order to check the contacts.
I will give it a better look when it is better out
thanks for the feedback
--
-J- 91' 744 at 151000miles

Check out both the front and back signals on both sides, also the tail/parks, they can feed back into the circuit if they mash and short out and cause some weird problems depending on how the current finds its way back through grounds.
--
97 S90 with 184K miles still going strong