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Re: 87 jeep cherokee won't start
OUCH!!! If there was no previous wiring problem, first check that you did not inadvertently ground a hot wire somewhere. Then check the starter & solenoid for internal shorts. (Ive seen some wierd stuff along the way, including a brush assembly that broke and the spring shorted out an entire starting system). Unfortunately, you will have to cut open the wiring harness and replace all burned wiring. Be careful to seperate any fused together wires without breaking them. Use the same gauge wire when repairing, to avoid overheating of new stuff after repair.Wrap wire ends together, then solder all connections. Squeze type junctions do not work all the time. good luck
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start solenoid sounds like the culprit. the start is a breeze to replace. 2-3 bolts and the two power wires. make sure you disconnect the bat. once you have it off the auto parts store should check the starter for free. have them do that befor you buy a new one. also check the fuses if the starter and fuses are good then the ignition is the final link to this puzzle hope this helps
Make sure the battery is fully loaded, check voltage when the key is turned to START. If voltage drops below 10vdc, jump start vehicle and have starting/charging system at AutoZone or similar auto parts store. If voltage at the battery is good, check wiring from battery to starter solenoid, make sure terminals are free of rust and corrosion and tight, wiggle the wires to make sure no loose connections exist. You should get the same voltage at the starter solenoid as you did at the battery terminal, if not replace cable. If you get same voltage at the starter solenoid, the solenoid itself or the starter may be worn/defective. There is a starter rebuild kit available at auto parts stores for a fraction of the price of a new starter.
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Bad solenoid i would guess. Not making a connection there. Any basic wiring and ignition switch problems should be alleviated by jumping the starter with a screwdriver. I would check the solenoid and starter brushes
Sounds like the starter solenoid is stuck on, most likely need to replace the starter, sometimes what can be done is tap the solenoid with a wrench or a small hammer and it may come loose, if it stops i would still recommend replacing the starter because it will happen again 9/10 times. Also check the wiring to the starter and make sure the start wire is not shorted or installed improperly. If there is constant voltage at the smaller start signal wire, the problem is somewhere in the wiring or the keyswitch.
Used a test light at starter, on small wire check for voltage while some one turn key to start.if you do have voltage there starter bad . Replace it. If you need to move truck tap starter with hammar while some one turn key to start.Remember you'll still need to replace starter.