I have a 89 and we were up wheeling a walker valley and the nss went out and the jeep would not start so I jumped the starter with a screw driver and then never shut it off till we got back down to the trailer.
it is not hard to see nss just climb under your jeep passage side and look at were the trann and motor bolt together there you will see the wire harness and switch. Got home went to local pull apart or junk yard pulled one and put it in works great 5 dollar fix.