Will not start

Check for power to the starter solenoid with the key in the start position. Chances are you have no power signal to the starter. If you have power at the starter it is most likely a bad replacement starter. If there is no power you need to check the ignition switch for power out in the start position. If there is power there you need to check the starter relay

stock engine?
i did not decode that, at all.
has power? (what 12vdc power or engine power)
turn key it wont start but does it crank.??????? fast..
and lose power, what power is lost 12vdc power or engine runs but lost power?
the power is back what power? name something, specific,
like 12vdc power, starter power, engine power.
the starter wont work, i take that its silent?
or
starter spins but engine dont?
or starter clicks
or starter, is weak
or ???? try to be clear,

no engine stated.
no transmission.

if stick shift the clutch switch must work or the starter will be dead.
does that help
ever hot wire a starter, see this.
http://www.fixkick.com/nocrank.html

if engine will not crank, say that.
then say sounds. it makes if any.

to get power from the switch to the solenoid you will have to hold the key in the start position as there will be no power in the run position or the starter would be engaged all the time.

Do warning lights and gauges come on, when key is turned to on?
If yes, check for power on the small wire at starter solenoid mounted on the starter with the key held in start. If power at the solenoid, take starter off and test for a bad starter or solenoid. If no power at solenoid when key held over to crank, work back to the switch in the start circuit-starter relay, clutch or neutral safety switch,-power from the start wire out of switch is not getting to the starter solenoid.
If no warning lights or gauges work with key in on position, power is either not getting to switch (bad maxi-fuse or fuse link, or bad battery connections-clean and tighten, recheck)-or the switch itself is not sending power out. Check if battery is charged up. Check all connections and grounds for loose, poor connections.
The start circuit starts at the battery, then to ignition switch, then out of ignition switch on the start wire to the clutch switch (or neutral/park on automatics), and on , ending at the starter solenoid on the starter. Somewhere in your starting circuit, power is lost. Start at the battery-check charge, check connections, check ignition switch.

With key on, do the warning lights and gauges come on? If yes, next is to check the start wire from ignition switch to the starter solenoid. The only time this wire has power is when the key is held in start. One could pull off the small wire at the starter solenoid on the starter, and check if it has power with the key held in start. If it does have power, may be a problem with the starter solenoid. But if no power on that wire, you will have to trace the wire from switch to starter. Not a direct path to the starter though. There is a park/neutral safety switch that the wire has to pass power through, so in park or neutral you would have power in and power out of the switch. If you have a manual transmission, substitute a clutch safety switch (or clutch inter-lock switch) for the park/neutral switch. If you have this, easy to check for power in/power out of the switch, with clutch pedal depressed and key held in start.
There is also likely a starter relay in the circuit. If you can find it and if you have a test light or voltmeter, you can do some checking here to see if your start wire still has power. Pull the relay out, key off. See if any terminals the relay plugs into has power. May or may not, depending on how the wiring is set up for the relay. But now if you hold key in start and check all the terminals, there should be at least one (maybe two) terminals that have power, where they didn't have before. That tells you the power is still getting out to this point.
If you have a theft deterrent system, and it is activated, at this relay is where it may come into play-not letting power pass through to the starter solenoid on the starter.
Sorry I do not have a wiring diagram so could give you more specifics. Hope you kind of get the picture, though. Large maxifuses pass power to the ignition switch. The switch sends the power out as demanded. The start wire out of the switch going through the start circuit to the starter solenoid only has power when the key is held in start.

Just concentrate for the moment on the battery, starter, and ignition switch. Your 92 jeep is a complicated marvel, but all you need to do is get the starter turning the engine for all those automatic things to happen and turn it back into a mobile jeep.
As long as you have battery power at the switch, and even bigger battery power at the starter, and you connect the three of them together...instant bingo, the engine starts, or should if everything is working right. If I understand you right, you do have power to the switch, just nothing in start, or you 'd have noted that. Check engine light on, and warning lights and gauges work, yes? Then the switch is working that much, anyway. The switch start position should transmit power to the starter on the small wire that is on the starter. You can check for power there when the key is held in crank (start). Easy to check with a meter or a testlight. You stated battery and starter are good, so if the cable connecting them is good and tight., your problem may be in the start circuit from the switch to the starter (starter solenoid, to be exact). So it's ign. switch to starter relay to starter (solenoid).. Check for power on that path. Quick check at starter relay: pull the relay out (in the power distribution box) it connects to 4 terminals.. One terminal should be hot all the time. check with testlight. If nothing there, check the 40 amp fuse or battery connection or wiring. If one is hot, then have someone hold the key in crank. Now 2 terminals should have power. If not then ignition switch or the neutral safety switch or the wiring between them needs diagnosing. If two terminals do have power, try another relay. maybe yours went out. If a good relay doesn't help, then starter solenoid or starter or your wiring needs further troubleshooting. Hope you find it, over...

Power will run from your ignition switch to neutral start switch on automatics, or clutch safety switch on manual transmissions. Those items, along with a starter relay, are all wired into your starting circuit, the start wire going to the starter solenoid on the starter. Of course, make sure your battery is fully charged. Use a multimeter and verify you have 12 volts to the big cable end on the starter. Now see if any power is on at starter solenoid terminal, with key in cranking position. If is power, remove starter and repair. If no power when key is in crank position, you'll have to trace your ignition starting circuit back to your ignition switch. can be a hassle, but, persistence pays off. BTW, when key is on, your dash lites do come on, don't they? Asking because that verifies you have power to ignition switch.

You will have to check, at the starter, for power to the SMALL wire on the starter solenoid (which is on the starter) when turning the ignition switch to start.
If there is power to this wire ( usually purple ) and power at the LARGE cable ( from the battery ) at the starter end.....you need a starter.

If you do not have power at the small wire at the solenoid with the key in start position and battery power is OK.....check the safety neutral switch.Moving the shifter around a little can sometimes allow the car to start if the neutral switch is worn.

A new battery does not always mean a fully charged battery.
Try a boost from another car before testing the starter for power.

The battery cables need to be clean and tight....and check the ground to the engine as well.

Everything else may work OK with bad connections,they don't use the power the starter needs to turn the engine over.

make sure you have power getting to your starter when you crank. check the small nut on the starter. should have 12 v or very close to it. this will tell you if your getting power to the starter or if somethign before the starter and something maybe with your anti theft system or not. its hard to say online cause of that anti theft. doest the light flash at all? the anti theft light?

if your getting power to the starter when you crank make sure your getting good power to the starter by turning on the head lights and see if they dim. a good starter will cause the headlites to dim when attempting to start. if nothing dims check connections. or assume bad starter motor. make sure your also getting power to the main starter stud as well.

good luck
michael

resistor.............tell the mehanic