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Re: 91 jeep wont start
The neutral safety switch on those (auto trans) are a bit complex and expensive. They can be removed and serviced(other than buying a new or good used one, best to do). To bypass, use the two center contacts in the harness plug, opposite the plug latch. Don't forget though if you leave the toggle on, it will start in any gear!!l Do not leave harness unplugged if bypassed as shift solenoids in trans get their signal through the harness!
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Check you battery connections. If they seem ok then get a volt meter and check voltage at the starter solinoid. If it is battery voltage then the small wire at the solinoid have a helper turn the key to start and you should have 9 to 12 volts. If this checks ok then you should have the starter checked. If no voltage the if is a automatic then check the nuteral safty switch. or ingnition switch.
The security system only disables the starter so if the engine spins but doesnt start then its no the alarm system, if you turn the key and nothing happens then it may be alarm, these jeeps often have a bad lock switch for the alarm and if its not spinning to try and start then try locking and unlock the pass/side door, again if the engine is spinning over but wont catch then there another problem, the trany problem is sperate has nothing to do with the starting with the fluid level first if its low add oil and retry if it still acts up then have a trany shop test drive, may have a bad or weak trany.also try sparying some starting fluid into throtle and see if it runs for a while because these jeeps also have problems with fuelpumps, if it starts then you may have a bad fuelpump,this is only if the engine spins over when key is turned, hope this helps.
Fuse? Did you check the lamp socket for voltage? Could be the switch ... Where is the switch? ... probably on or near the steering column ... or in the trans ... I dont know for sure in this case. Check for voltage which I suspect will be none because of a fuse or a switch issue.
try it in nutral put in park and hold up and or jigle up and down in park, dont come out of park jiggle while u hold to start,check large fuses anything marked starter check cables cable ground to engine ,check nutral safty switch check starter , and starter wire ing wire at starter with test light small wire on starter while someone trys to start jeep ground test light to a good ground and hold point on small wire on starter it should light up if it does your starter is bad ,if it doesnt light up check ignition switch on steering colum ,most likely bad
pull a wire and ground it via useing a screw driver at the end of the spark plug boot to check for spark / if their is no spark / ignition control module / there is also a crank shaft position sensor / located on the back side of the motor under the coil packs / pain to get to / also the nuetral safty switch / to check the neutral safty switch diconnect the big harnest at the neutral safty switch put a fuse tester to the yellow wire / have someone turn the key / with the tester grounded the light should come on / now we know the ignition switch has power going through it. if there is a no power at the yellow wire / bad ignition switch / does the car have a relay located at the top of the radiator core support (up by the radiator looking down drivers side)if it does not gm will install one for free / if there is / look for the purple wire coming out of the relay and Follow it down to the starter / reconnect the neutral safty swtch / touch the small S (the smallest screw) terminal on the starter soilenoid / have someone turn the key forward check the light / this will detemine if the relay is good / CAREFULL NOT to touch the big starter wire with the little one it will jump the starter / I HAVE THE SAME CAR / Hope this helps
if it is automatic transmission try to start it in neutral, and see what happend, but if it come whit manual transmision, then check the cluth switch, you can by pass the switch and try to start it, if it works then replace the sw, but if not the look to see if there is a starter relay and replace it, most of this come wiht starter relay and they fail.