My 2005 Jeep Grand Cherokee with 50k miles has total electrical failure. Drove to lunch, tried to start 20min later, remote entry worked, turned over for split second then... total electrical failure. I don't believe this to be a mechanical problem, it seems as though something is preventing the car from starting/ using any electricity. Anti-theft?

first is diagnosis.
you examine and test it. to see if its electrical or mech. failure.
and once discovered that follow that to logical conclusions.

have you tried to replace your fuel injectors or your spark plugsif not try checking your fuel injectors electric socketit couid be loose

Sounds like the fuel pump is going out. Replace the filter first, as it's only $10. If that doesn't fix it, then it's probably the pump, which is $250.

try disconnecting your battery for a few minutes then reconnect. That might clear your system and reset it. Hope it works. It does on most but there are those rare few it doesn't. Good luck

blower moter resister

PLESE DONT EVEN TRY.it aint that simple,the computer tells the engine that you have the right key but as you dont have remote locking anymore it thinks your trying to STEAL it.you NEED to replace the remote fob.(you call it keyless entry)think of it this way if it were that simple why fit an alarm system in the first place....(someone asked if you could take out a fuse to stop the alarm !!!!!.)

Every morning at lunch time and evening my jeep won't start. It doesn't grind but the electrical goes crazy. After a couple of trys it finally starts. Help

if the battery is weak,it does not have the rpm needed for the computer to start the vehicle.
if your immobilizer is kicking in,it will not start.
get the electrical checked out.

blown fuse is a sign of a problem of a bad elect. circuit,grounding wire,wires touching each other,pinched wires,corrosion in elect.connection,unless its a common problem it can be hard to find!seems theres no quick fix,maybe they should refer you to some one that specializes in car elect.problems.