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Under the hood, at the front of a 1990 Buick Reatta, the horn is located on the driver's side, behind the fog light and mounted to the frame. If you lay down at the front of the car and look up under the fog light, you will see the horn.
In the Reatta it is located under the dash next to the steering collum. Silver box has "central power supply" printed on it.
Put a socket and ratchet on the tensioner belt pulley. Pull to the side, releasing the belt tension. Remove the belt and put the new one on, a helper will make this easier. Take the ratchet off to re-tension the belt.
There is none on GM vehicles.
I have found the easiest way to replace the sidemarker lights is actually from underneath the vehicle. I you can get the bulb out from underneath, with a squeeze and a twist, the bulb can be replaced without removing the whole assembly.
it sounds like your neutral safety switch
Pull it out and put a new one in place.
Take it to a shop
The fuse box panel for a 1990 Buick Century is located on the driver's side of the car interior. It is just below the headlight switch. There is also a fuse box panel for this vehicle located in the engine compartment near the battery.
Located in the fuel tank. Most likely will have to remove for access