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if you unhooked your battery you should check your cables and make sure they're tight, it could just be a loose ground cable.
other possible problems are:
1. something wasn't plugged back in
2. coolant levels are low
3. or the worst possible scenario is that the timing belt broke which would cause the engine to over heat and depending on the year of the engine you've destroyed the top of the engine and it will all have to be replaced.
Check all your fuses. Check all you charges (batteries, cigarrete lighter, radio) is that works. Then You have a brain problem. It's been a while seen I have seen a Jimmy, but they have a relay switch to the brain, and OUT or the brain. Sometimes, things just Die. I don't know the check for the brain, but it is available in a Haynes book ($30)
don`t just change parts because someone told you to without checking it out first.with the brake light on check the fluid level in the master cylinder if its down check the float in the cylinder as these will get stuck.also check for fluid leaks in the entire brake system and condition of the brakes themselves as when they wear especially the disc brakes the fluid will go down as the brake fluid takes up the worn brake material so the calipers don`t have to move as far to apply the brakes.the master cylinder is the component that holds the brake fluid under the hood that you would top up if low.the brakes booster is what the master is bolted to and gives the car power brakes as opposed to manual brakes.
i had the same problem and replaced the fuel pressure regulator. Cost about $45 at advance auto store or about $90 at napa auto stores. Once i replace that my truck started right yup and runs like a champ
Had similar problem in my 2000 Jimmy. No hot air from heater. Had the shop (Midas) disconnect heater hoses at the fire wall and blow out the heater core with air hose. Got rust and junk blown out. Hooked up and flushed system with new anti freeze. Got lots of heat now.