Look in the glovebox under the parcel trey that is in there. It is actually under the glovebox but you access it thru the glovebox.
Pull the turn signal stalk.
switch is down on the left mines a push type
In the fuel tank
its in back valve cover at fire wall i removed the plenum from the intake manifold to get at it.
You have to put it in the overflow tank.
With money take it to someone who knows.
In the tank
It is built into the alternator.
The most obvious thing to check when a 1991 Oldsmobile Cutlass Supreme won't start is to make sure that the vehicle has gas. You should also check the battery. If the car clicks when you try to start it, it is likely the alternator.
The horn relay on a 1991 Oldsmobile Cutlass Cierra is located on the passenger side firewall inside the engine compartment. It is just to the left of the blower motor assembly.
on the turn signal switch
Behind the driver, under the frame.