My air shocks are down and i don;t know what fuse to look for

there was an air pump as i remember that automatically adjusted the level, those systems (usually the shocks) were notorious for going out as they aged the seals went bad. it's an expensive fix ..a lot of people used to change that out for normal springs ans shocks or aftermarket air shocks. if you do that be sure to save the old ones because the car will be antique one day and it will keep a new restorer from locking everywhere for those shocks. BTW i'm almost certain they are "rebuildable if you can take some time with it.. keep in mind this is the worst case.. it could just be a bad pump or a bad wire, or relay or maybe a fuse.. .. just be prepared for it to be the shocks themselves .. good luck with it and don't let it get you down there is no need to make it a bigger deal than it is..

Would say it depends on the vehicle and your load. My rule of thumb is to start at 30 PSI and gradually increase until vehicle just starts to rise. Adjust as you feel for ride. Increase pressure if you will carrying a heavy load and the rear drops. Usually air shocks max out spec is 100 - 120 PSI. More may cause damage to the shocks. Hope this helps

You want to replace the air ride? I think that car would have air bags and not shocks. I have a friend that has one of those older huge Mercury Cougars and hers has air ride. The pump went bad and as I searched for new pumps I did find a site that sells a kit to replace the air bags with coil springs.

I don't know what the site was anymore but I do know they are out there so doing a web search would not be futile.

Reasonably easy to install. Remove the old shocks and replace them with the air shocks. Place the hose fittings where they won't run into anything. Attach the hoses and run them to the rear bumper. attach both lines to the "t" fitting supplied in the hose kit. find a hole in the underside of the rear bumper (or drill one) and mount the "t".Fill the shocks to around 40psi and check all your connections with soapy water to make sure they don't leak. Secure the lines to the chassis so they don't hang down and you are finished! One note. The fittings do not need to be super tight. the small "o" rings in the kit are pretty fat and usually seal pretty well hand tight. On a truck, generally you don't need to jack it up to do the job. If you do, take care not to raise it so far the wheels hang as the rear can drop when you disconnect the shocks.
It won't fall out but even a drop of several inches can hurt if your head is under there!!

you need to jack up car until both rear tires clear ground.use two jack standsand place them on the subframe. on most gm (olds) i jack the car up right in the middle of rear crossmember. set jack stands ,when letting down car MARE SURE CARS WIEGHT IS BEING SUPORTED 95% ON STANDS.let jack down.make surecar is stable i give it a shake. don't remove jack.you need to jack up rear crossmember 3 to 4 in. it takes the wieght off old shocks.Therev are two diff.style shocks gm used #1 shock had holes in both ends of it.#2hole in bottom and threaded shank on top. its pretty strait forward with #1 style shock make sure you use all new hardware that came with shock. #2 style can be tough somtimes, i let tension ( some )off jack be cause i use a air impack to remove upper nut on shock but if you don't have air tools, at tip of shock you will notice a 2 flat sided tip use a 1/4 in wrench to hold top from turning while using 1/2 in wrench for nut removal also on this style shock tighten down just till rubber squeezes 1/8 in past washer. if tou over tighten on upper style #2 shock it will split new rubber washers.#1 style can be tighten till stops. hope this info is what you needed. B. HARRIS A.S.E. Cirtified

Your air bags are whorn out, These usually last around 12-15 yr,s maybe more maybe less. to repair you have to take to a garage, And this is expencive, But there is a alternitive , You can remove the air bags and put on a set of regular shocks, This will be a lot cheeper on you. You might check around a salvage yard, but you just don't know how long they will last. Sorry can't help more, Wish you the best of luck.

the air shocks are down,where are the fuses for that system, pump and how do i check to see if the unions are bad or leaking

Yes you can replace with regular shocks. You will want to remove the fuse so the pump no longer runs and you will be OK.
Good luck.

That is an indication that your air shocks at the rear needs to be replaced or there is a sensor that may have gone bad, event the air pump mey not be working. Most owners replace the more expensive air shocks with good conventional shocks like Monroe Reflex Shocks if there not towing heavy trailers. You can have the conventional shocks installed and have the ride control system deactivated. First check your fuse just t make sure the fuse to the air compressor has not gone bad, and the air ride leveling sensor, wire harness has not been damaged due to corrosion. 

Have you had any work done on the truck recently? did you take it somewhere that they had to place it on a lift? with air shocks a lot of places don't realize they have to shut off the air and let the truck settle before it gets lifted, sounds to me like you might have a hole somewhere in the rear shocks. well hope this gives ya something to be able to figure it out...