Battery keeps drianing alternator test good but have a short in the engine ignitin feed

it seems like the battery is going. clean battery terminals, also the grounding to the body (engine block, transmission, etc.) all should be shiny cleaned. suggest you go to autozone (or other auto parts) for a free battery & alternator tests.

Usually that fuse powers the alternator and the fuse box.
It would have to be a big short to ground to blow that fuse.
Its possible the main wire to the alternator is touching a metal spot, or the alternator is shorting out inside when it is running.
What is draining the battery may be something else, or the battery could be discharging after the fuse blows if the alternator is not charging it.

They are not supposed to have battery feed when ignition is turned off but will bring the engine check light on

Sounds like battery or battery cable problems to me.
If the battery is bad, you cannot trust ANYTHING the computer is telling you. They tend to set all kinds of codes when the battery has a shorted cell. (including fuel pump circuit and transmission system codes) They get "delirious" from malnutrition. You need to have your charging/starting system thoroughly tested.

Please read these articles:
My Car Won't Turn Over

What Else Could Be Wrong?

REPLACE BATTERY CABLES.CHECK ALTERNATOR FUSE AND CHECK ALTERNATOR BATTERY FEED WIRE OR VOLTAGE REGULATOR WIRES NOT DAMAGED AND HAS A LOOSE CONECTION.MAKE SURE DRIVE BELT NOT SLIPPING.HAS THE CORRECT TENSION.

CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES IF THEY TOUCH GROUND IT WILL SHORT OUT ALTERNATOR IN A QUICK SECOND. IF YOU DISCONNECT POSITIVE WIRE FIRST IT WILL SHORT OUT ALTERNATOR.CHECK ALTERNATOR WIRES FOR FRAYED BROKE PLACES.MAKE SURES RED 10 GAUGE BATTERY FEED WIRE NOT GROUNDING OUT OR TOUCHING ANY PART OF THE ENGINE.BESURE TO PUT ALTERNATOR FEED WIRE IN FLEXIBLE CONDUIT SO IT WONT GROUND OUT.AUTO PARTS STORE SALE FLEXIBLE CONDUIT FOR WIRES.

LOSING POWER WHEN RUNNING COULD BE LOOSE BATTERY CABLE.FAULTY ALTERNATOR.NOT CHARGING BATTERY.CHECK BATTERY VOLTAGE SHOULD BE 12.6 VOLTS.WITH ENGINE RUNNING ALTERNATOR POWER OUT PUT SHOULD BE 13.5 - 14.5 VOLTS WITH ENGINE RUNNING IF NOT ALTERNATOR BAD.CHECK ALTERNATOR BATTERY FEED WIRE CHECK ALTERNATOR VOLTAGE REGULATOR WIRES AND CHECK ALTERNATOR FUSE AND MAKE SURE DRIVE BELT NOT LOOSE.BESURE TURN OFF RADIO BEFORE REMOVING NEGATIVE BATTERY CABLE TO KEEP FROM LOSING RADIO CODE.

maybe. Do you have a voltmeter? Check voltage at battery with engine running. Should be at least 14 volts. no voltmeter? take alternator to parts store for testing.

If alternator is good, check for shorts. Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

CHECK POSITIVE BATTERY FEED CABLE TO ALTERNATOR AND CHECK ALTERNATOR FIELD WIRING THEY ARE CLOSE TO THE ENGINE BODY. GO TO AUTO PARTS STORE GET SOME FLEXIBLE CONDUCT PLACE ALTERNATOR WIRES IN IT AND REROUTE WIRES THEY COULD BE RUBBING INTO BODY CAUSING SHORT BLOWING OUT ALTERNATOR.THE CADILLAC 4.6L AND 4.9L ENGINES THE ALTERNATOR IN A TIGHT SPOT CLOSE TO THE ENGINE WHERE THE ALTERNATOR WIRES CAN RUB BODY SHORT OUT.CHECK WIRES AROUND ALTERNATOR CAREFULLY.

lets say you have had the battery tested and it's ok?
(as bad batteries do hold charge but only for a short time)

the fluid inside the battery is at the correct level?

when u start the car you should be able to disconnect a battery lead and the car should keep running, (alternator test)

if everything checks out so far?... use an amp meter across the fuse terminals to see what is drawing excessive power.

Its a process of elimination. always start at the simplest part and work through.