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do you have the vin so I can pull the correct wiring diagram for your jeep?
there are 2 fuses in the starter relay circuit and I need to pull the diagram to determine which they are
I need the vin to be sure you and I have the same vehicle, AND all our wiring diagrams are vin specific the vin will also be on the door plate
do you have a test light and are you near the jeep?
I need you to test for power at the relay
if the relay is clicking the pcm and ignition switch are providing power to the COIL PORTION of the starter, which DOES NOT MEAN there is power at the LOAD side of the relay, remember any relay has 2 circuits 1 for the coil that energizes the relay and closes the contacts and 1 for the CONTACT or LOAD side, so if you provide power to the brown wire on the relay which is 1/2 of the load circuit have you tested for power at the OTHER side of the load circuit, do you know how to properly test a Bosch style 5 pin relay?
I can provide instruction if needed, BUT remember there are 2 fuses on the circuit have you checked BOTH fuses?
without the vin I cannot say for sure the fuse numbers
and we have some confusion now as well you have the jeep listed as a 2000 but you also say the door plate says 1999 so I will definitely need the vin to properly get the correct diagrams, as from year to year we did change the fuses slightly and their locations
there are 2 fuses here one for the coil side and 1 for the load side THEY DO NOT INTERACT WITH EACH OTHER, on the starter circuit the coil of the relay is protected by it's OWN FUSE and the load HAS IT"S OWN fuse, so on the relay you will see some numbers 30, 85, MAYBE 85a, 86 and 85 pins 86 and 85 are the coil and NOY CONNECTED TO pins 30 OR 85 (a) pin 30 is a power to the load (your starter) and needs constant power this is the pin I need you to look at REMEMBER ALL RELAYS need 2 sources of power does your relay have 2 power sources?
look through this article and it will give you an excellent explanation of the way a relay works, you have a slight misunderstanding of how the starter circuit works.
have you swapped relays with another just to rule out a bad relay?
no not mad but 99.9% of our customers have difficulty understanding electrical, and for the short time I taught automotive before getting back into the dealership life teaching relays was the 1 thing that stonewalled nearly every student.
so basic relay operation would have to say if you have power at pin 30 which is the feed to the starter on the relay contact and transfers power to pin 87 which is the starter solenoid wire (brown) NAD you are 100% sure the STARTER relay is clicking by putting your hand on it while someone cycles the key , which would mean the coil side of the relay is operating then you have a bad starter relay.
now since I am not there lets start at the beginning I would bet you're hearing the ASD or FUEL PUMP relay clicking, so I would go to the starter relay and with a test light and an assistant check for power in crank and then switch the test light to test for ground at the other pins