I have a 2003 Jeep Grand Cherokee that won't start. Can't read codes - claims we need to check connections. Cranks fine. Notice that fuel gauge and battery voltage does not register anythin

SOURCE: 96 jeep grand cherokee wont start

my 1996 jeep is doing the same thing.the fuse I have been changing is under hood in fuse panel on left 20 amp sm. in center of fuse panel closest to bat.

SOURCE: 93 Jeep Grand Cherokee Won't start

Are you getting spark from coil wire when cranking? If so, check the cap & rotor. If not, the most common failure is the crank sensor. If you have a 4,0, you can find it on the drivers side of the bellhousing, in line with the flywheel, just where it's annoying to work on. There is a test you can make, but I don't have the specific test values or the correct terminals to check. (you can find that info in any half decent manual.
Good luck

SOURCE: 93 Jeep Grand Cherokee Won't start

The crankshaft position sensor was seriously problematic in those old jeeps. It's located towards the top of the bell housing slightly to the driver's side I think.

SOURCE: 1995 JEEP GRAND CHEROKEE RAN AND DIED WILL NOT START

IS IT THE 4.0L?IF SO U MAY HAVE A BAD CRANKSHAFT POSITION SENSOR.

SOURCE: 99 jeep cherokee sport 4.0l 6cyl voltage will go to 19v

The problem sounds intermittent, if you put volt meter on the battery while it is at that 19volt mark/reading(on the gauge cluster) you will be able to see if it is true. If your alternator is really charging over 16volts the lights should be getting brighter then usual and/or they are burning out. Find out ASAP, if the alternator has a defective voltage regulator, it needs to be replaced. Prolong use will damage components.