For 1992 Wrangler, manual transmission, able to jumper across the hot and start connections on the solenoid to start the truck, but nothing when the key is turned.

if the battery is good.
and charged.
then the solenoid jumped will crank engine,(not start if you keep keys in pocket)
if that hot wire test fails and the battery and its lugs not green.
then the starter is bad.
try using a fresh known good battery first.
or jumper cable (AAA style) jump start it off a running donor car.
if the hot wire fails now, the starter is bad or the enigne is siezed.
can you spin the engine by hand, (using a socket and breaker bar , keys again in pocket::>?)
battery >>>>>>cables>>>>>starter.
this is all it take to crank the engine, just that. if you know how to hot wire a solenoid, do you? the switch below is just a jumper wire or even old screwdriver blade.
http://www.fixkick.com/starter-hotwire.jpg


battery needs to be 12.6vdc rested, is it ? or more.
less is discharged(and normal temps, not -40F)

the oldest GC.
see photo below... jumper at J.
as you can see security has zero to do , here.
if hot wired. zero.

Could be the starter motor, a bad solenoid or bad battery connections.

Hi there
Tap the starter motor and solenoid with the wooden (handle) part of the hammer to loosen the internal workings, a possible layer of rust formed on the inside of the starter.
Regards
Phillip

next is jumper cable jump start to good running helper car battery.
that cuts cause in 1/2 , 15min works.
car starts, your battery is bad, or not charging, running, or is only discharged. (left head lights on)
wont crank. now?\\
hot wire the solenoid, for cutting possibles in 1/2 again.
what transmission? in car?

see tricks here. (and the hot wire trick)
http://www.fixkick.com/nocrank.html#tricks

The transmission range sensor , park neutral safety switch . Is fuse #23 60 amp in the engine bay fuse block good ?

you have an ignition voltage problem or ignition box failure.

we had a jeep with similar conditions at my college and we found it to be the crank sensor and it started and continued to run so test the connection and see if there is 5 volts going to the sensor

the plug of the transmission of 1992 jeep is under the transmission case .

Check your battery connection both @ the battery, ground connection on firewall/fender and starter/solenoid .. you have a loose or bad connection ..

is this a manuel or automatic transmission? if its automatic try forcing the shift lever forward while trying to start, if its a manuel check the clutch pedal switch , if no luck with those check to see if the ignition switch is giving 12volts in the start position, if not then just put a momentary contact push button on the dash and put key on power to one side of the button and the other side to the small wire on the starter then you have yourself a push button start with the key on only so there are no accidents, please rate -jeff