It sounds like you have a major current draw, the alternator may be draining to earth internally . Once you have the engine running you need to check the charge rate from the alternator as it is controlled by the main computer .Also make sure you don't have interior lights such as a vanity mirror or glovebox light stuck on. This will be enough to kill a battery overnight.
SOURCE: 1998 Jeep grand cherokee Laredo
When it sounds like it wants to start but won't, it is almost always a fuel problem. When you first turn on the ignition key (radio off, in a quiet setting) do you hear a faint 'hum' from the rear of the car? If so, your fuel pump is probably alright, so the next check it to remove the small, light green plastic cap (it might be black, about the size of a tire valve cap) on the top of the engine-it is part of the fuel rail and has a small pin in the center of it. With a rag in your hand, hold it over the valve, and with the key on, use a small screw driver and push the pin in-the rag will keep you from getting sprayed, if all is alright, but if you get little or nothing, you have a problem with your fuel pump, filter, fuel regulator or you may have a plugged 'sock' at the bottom of the tank.
SOURCE: 93 jeep grand cherokee laredo wont start unless i
Check the cables and cable connections to the battery to make sure they are tight and free of corrosion. Test the battery and make sure it doesn't have a bad or dead cell in it which would cause it to not have sufficient amperage to start the motor.
SOURCE: Was trying to jump my 93 Jeep Grand Cherokee
HOOKING BATTERY CABLES WRONG COULD SHORT OUT ALTERNATOR AND THE ECU.
SOURCE: 2002 jeep cherokee laredo won't start new battery
The Jeep DTC P1491 code is actually radiator fan control relay circuit.
Soft reset if the battery disconnect would have erased the code; the first thing I would replace for that code (fan relay).
Additionally, its possible thta your THEFT system is activated, check owners manual to disarm.
Hope this helps.
SOURCE: 94 Jeep Grand Cherokee will not start
just had this happen on same type of car
drove me crazy for DAYS.. FOUND IT WAS JUST AN ALTERNATOR FUSE.!!! UNDER BLACK BOX BEHIND THE BATTERY
FIVE BUCKS AT ANY AUTO STORE...
THIS WAS AFTER SPENDING 120 ON A NEW BATTERY....
THATS ALL IT IS
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