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Old 05-08-2011, 05:30 PM   #1
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electrical issue help please

Hi guys im new here and really could use some help. I was installing some driving lights on my tj the other day and somehow shorted out the whole jeep. All fuses under the hood are good and see power but the fuses under the dash have nothing. Is there anything between the fuse boxes that i could have blown to cause this issue. Thanks in advance for any help.

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Old 05-09-2011, 11:47 AM   #2
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Dan, dependent on the year, you will also have fusible links and/or a PDC (Power Distribution Center) The PDC uses MAXI fuses, the fusible links should be grouped together. The PDC is by the battery, most likely the same for the links or they can be mounted on the fire wall if memory serves me.

Look for a group of possibly PINK heavy gauge wires grouped together, they each will all attach to a smaller gauge wires, and normally have a black/gray colored plastic boot on them. Those are the links. Probe for power on each side. Find the ones you blew out, and replace em. Most auto parts stores carry them.

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Old 05-09-2011, 01:58 PM   #3
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thanks for the reply and sorry i guess i forgot the year in the post its a 97 6cyl with a 5 speed I will have to check for the fusible links. The power distribution center is the large fuse box right next to the battery that the power wire goes to from the battery correct? if so then yes i have checked all of the fuses and they are all good. im starting to wonder if there might be a bad ground somewhere. im going to look for the fuseable links now
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Old 05-09-2011, 02:05 PM   #4
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also is it at all possible i blew the computer...if so how can i check it
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Old 05-09-2011, 02:11 PM   #5
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Have you checked the fuses in the panel behind your glovebox?
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Old 05-09-2011, 02:24 PM   #6
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the fuses behind the glove box are all good still but using a multimeter i get no power at them...
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Old 05-09-2011, 02:46 PM   #7
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keep tracing it back from there with the volt meter... somewhere between the fuse panel and the battery there is either something tripped, melted or disconnected.
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Old 05-09-2011, 03:00 PM   #8
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Quote:
Originally Posted by sevenservices View Post
keep tracing it back from there with the volt meter... somewhere between the fuse panel and the battery there is either something tripped, melted or disconnected.
x2^^^ If you don't have power at the fuse panel it have to be somewhere in getting to the pannel
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Old 05-09-2011, 03:20 PM   #9
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do you know if there are any fuses or anything between the power distribution center and the fuse box also the loom goes from the fuse box under the battery across the fire wall and into the jeep on the drivers side and then it goes back to the fuse box or am i not seeing this right??
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Old 05-09-2011, 03:51 PM   #10
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Yes, what post #2 told you - a fusable link.

Did you do what he said?
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Old 05-09-2011, 04:00 PM   #11
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Dan, I just went out and checked the wifey's 97, yep the PDC is the big box by the battery.

Look at the BIG GREEN wire coming out of it and going down into the harness. It appears it is a fusible link. Check it for power at the terminal at the box then follow it down and check it below to see if you lost power. It's on the back side of the box, battery lead on one side, the Green lead is on the other, separate cover on the PDC box, not the one to access the fuses.
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Old 05-09-2011, 04:13 PM   #12
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ok i just got done checking the green wire at the terminal next to the pdc but where does that go from there . the loom splits to the alternator then the starter and then the block ground and the firewall ground...or am i not looking in the right place...thanks again for the help and patience i have no diagrams so this is all very helpful information
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Old 05-09-2011, 04:34 PM   #13
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Follow the Green wire, I just went out and rechecked it. Soon as it goes into the loom it changes to a BLACK / White trace wire. It is a fusible link. See if you have power below the Green wire where it's now Black/White. Only about 4 " from where it comes out of the PDC, it changes to the black/white. Pull the lead out of the loom, and check it.


If you don't have power you blew the link.

You'll need to pick up a new fusible link wire, the correct amperage/color. Get a new terminal end and butt connector to fit.
Cut out the whole Green wire and replace it with the new one.
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Old 05-09-2011, 04:37 PM   #14
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from some more searches it seems that the fusible link is between the terminal and the alternator and if thats the case i get power both at the terminal and the alternator
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Old 05-09-2011, 04:42 PM   #15
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While you are at the parts store, pick up or have them order you a Haynes repair manual.
Best $25.00 you will spend. Lots of photos/descriptions on just about everything on your Jeep and how to diagnose and repair it.
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Old 05-09-2011, 04:44 PM   #16
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Gimmy a bit, let me look up the wiring diagrams (in the Haynes Manual) LOL!
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Old 05-09-2011, 04:52 PM   #17
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i really appreciate the time and effort guys i checked on the lower end of the fusible link right before it enters the wiring loom and im still getting voltage there as well...
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Old 05-09-2011, 05:37 PM   #18
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OK, took a bit as the schematics are cut up and not linked together. As noted the Green lead off the PDC is a fusible link. It runs to the generator, from the generator power goes to the Powertrain Control Module, and from it to many many things.

But the way I'm reading the schematics, the interior fuse box is powered by some of the fuses in the PDC. I can't read the cover on mine to cross reference to the manual. But, other then a blown PCM, it appears it's still a fuse problem.

Sorry I can't be of more help. Tough doing it over the net.
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Old 05-09-2011, 05:46 PM   #19
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so im starting to wonder if this could be a bad ground...i have noticed that i am randomly getting power to the interior fuses 3-12 volts depending but the only way i can get any kind of consistent power is by using the neg terminal on the battery for the ground...is there a single ground inside the cab of the jeep that everything runs off of that i can try to replace or feed with a larger cable?
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Old 05-09-2011, 07:53 PM   #20
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There are two main grounds. One from the battery to the frame, the other battery to the body.

Now that you are saying you are getting "some" voltage, yes it could be a bad ground.

First things first. Take off the ground lead and power lead from the battery. Clean them and the battery terminals. Use a battery brush if you have it, if not some sandpaper will do. Both should be shiny not dull looking. Reinstall the cables and tighten them TIGHT! You should not be able to budge the terminals when it's tight.

Check for operation. If you are still getting a poor voltage reading go to the other ends of the cables and clean as before.
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Old 05-09-2011, 09:02 PM   #21
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i have no idea what i am doing but now not only do i have dome lights(very very dim tho) and the fan for the heat kicks on i also noticed that my brake lights are working....interesting because none of this was working before and i really dont think i did anything. im going to start putting stuff back in the dash tomorrow to see what does and doesnt work now so i can try to narrow things down i guess...
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Old 05-09-2011, 09:11 PM   #22
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Let us know what happens and what you find.
And best of luck.
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Old 05-09-2011, 09:12 PM   #23
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will do again thanks for the help and feedback
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Old 05-11-2011, 11:58 PM   #24
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ok so as of late i think i have gotten somewhere with my issue. when the ignition is off i have brake lights dome lights the hazzard lights dont turn on but make a buzzing sound and the horn has a buzzing sound as well. when i turn the ignition on i loose all of that. all lights turn off all noises stop. this happens as well when the light switch is on but the lights dont work. this leads me to believe the ignition and the light switch both are the cause or at least part of the problem i am having. does anyone have any advice or anything
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Old 05-12-2011, 07:43 AM   #25
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Doubt it's the switches. You are describing either a low power or poor ground.
Initial symptom, your system is just getting barely enough power to run some lights, soon as you increase the load there is not enough power to run everything, and they all fizzle out.

Ditto the second part, soon as you turn the ignition on, it's trying to power up all kinds of stuff, and same scenario, power feed to the request can't be met.

Go back to the battery. Check the connections with a fine tooth comb. If anything doesn't look prefect fix it. Loose connection, corroded cable or terminal, rust around a ground connection.

Grounds are a bane to Jeeps. I've seen perfectly good looking negative cables that were junk.

Try something. Take a set of good jumper cables. Find a good ground, and connect to it and the negative terminal on the battery. Try and get the connections at the battery so that the cables are touching the battery posts along with the terminals.
On the plus side, get a good bite on the battery terminal, and down on the starter lug. See if some of your problems go away.

If they do, get some new cables and terminals installed. Clean every attachment point so it shines before you attach anything together.
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Old 05-16-2011, 04:29 PM   #26
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Ok well after over a week everything seems to have worked itself out now and my jeep is running. Finally got it fixed by having to remove the battery completely from the vehicle to charge it. For whatever reason the battery would not take a charge while in the jeep and connected. After removing the battery and charging the battery and reconnecting it the jeep started right up without any issues at all and has continued to run as it should. Now I'm just trying to figure out why the battery can't charge being connected to the jeep and what possibly could be draining the battery. Again thanks for the help
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Old 05-16-2011, 04:41 PM   #27
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Charge not going back into the battery could be again something as simple as a poor connection at the battery.

Stop by an Advance or AutoZone, and have em run a system check. It will tell you right off if you have a problem in the battery/charging/starting system, and it's FREE!!!!


Charging the battery out of the Jeep may just be a cover for a still existing problem. It won't surface again till the battery voltage drops back down. Kinda like you are running on the battery and not the alternator. If you get my drift.
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Old 05-17-2011, 01:00 AM   #28
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As I was reading I was going to say it sounds like a dead battery.

You could have a couple different things going on here:

You could have just killed the battery, and now that it is recharged you are ok (and this is where I would have started looking) Always start with your power source it's self. No power? Is the battery it's self at 12.6 volts? Or is it low on voltage? After that do you get 12.6 (Or the same reading as the original) at the fuses, and light sockets? If the battery reads 12.6 everything else should read 12.6 as well, if it reads 7 everything else should read 7. If anything under normal circumstances reads less then the original reading in a disconnected battery, you have a power loss someplace and that is not normal.

you could have a parasitic drain somewhere (I think from a bad ground, connection, or wire. )

You could have a week alternator (you would quickly find this out when the battery kept dieing on you)

Since you disconnected the battery and charged it, and everything is working you should be okay. If it keeps dieing then I would have the battery tested make sure it has a full life left in it, have the alternator tested, and then if still having problems do an Ohms test on all the important wires.

If you have any problems, call AAA and tell them you need a jump start. They will come to you, and do a full battery, charging, and electrical test for free.

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