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Old 12-30-2012, 12:41 PM   #1
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pesky yj electrical problem

So the Jeep has been running fine I go inside the grocery store and I come back it won't start it just cranks and cranks but doesn't turn over. Luckily I was parked in front of auto parts store and the guy behind the counter was super nice he let me take a bunch of parts and try them out. Long story short I replaced every part behind the distributor and still would not get spark. checked the fuses double checked the fuses took apart the fuse panel cleaned all the contacts and still nothing. The store had only one new relay (i believe it is called a relay, located next to the battery) i tried it out on both positions and it still would not start and still no spark also i opened air intae above the tbi and did not see fuel. My friend took one of the relays off and stuck a pair of pliers and basically jumped the leads andi t fired right up. As it was running he pulls out the pliers and it dies we did that one more time and it fired right up. Bare in mind that all the original parts are back on. NEW PARTS! So just for the hell of it i ask him to p2ut in the old relay and it fired right up....... I am baffeled and electrical is not my strong suit please help. Also, i have only had one other issue like this in the last year, but i took the coil off and cleaned the contacts and it fired right up.

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Old 12-30-2012, 01:28 PM   #2
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I've had relays that worked on and off. It took awhile to find the problem good thing u found it right away.

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Old 12-30-2012, 02:01 PM   #3
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But it starts with the old relay now.... did i find and fix the problem?
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Old 12-30-2012, 02:39 PM   #4
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I had a fuel pump relay that would work fine for months and suddenly stop working then start. I went through 2 fuel pumps over 2 years before I just happened to tap the relay with my finger when it wasn't working once and it started right up.
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Old 12-30-2012, 06:19 PM   #5
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Is that the same relays that are next to the battery? Or are there others?

What is even more frustrating is that i put a brand new relay in and tried in both positions with alternating both of the old relays
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Old 12-30-2012, 06:39 PM   #6
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Just those. It could also be a short where the relay plugs in. Electrical gremlins can dive you nuts. It could b a short somewhere further down in the wiring and just a fluke that messing with the relay got it to work, that's happened to me with fuses. When its running wiggle the wiring harness going into the relay box and see if it causes any change and work your way down the harness.
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Old 12-30-2012, 07:23 PM   #7
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Thanks for the advice i will try that in the morning. My friend said to start by cheching all the grounds off both relays. I am not sure how many grounds there are, or even on which sway route i should start with.
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Old 12-31-2012, 06:16 PM   #8
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I found that the wires and connectors that go into the bottom of the pdc can come loose and not make contact so you may want to disconnect the battery and lift it up and push teh wires in those places up while holding the relay down to make sure its getting a good connection....
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Old 12-31-2012, 11:07 PM   #9
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Is the "pdc" where the relays are located?
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Old 01-01-2013, 09:10 AM   #10
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yes.... power distribution center
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Old 01-01-2013, 10:09 PM   #11
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Cool thanks, is that something i should make water resistant?
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Old 01-01-2013, 10:17 PM   #12
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Yes. Use some contact cleaner and a nylon brush to clean the connections then a squirt of dielectric grease. It's not a bad idea to hit every connector you see while you are in there.

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88 yj , electrical , no spark

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