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My name is matt. my sons 1998 jeep cherokee the tail lights

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Customer: my name is matt...
Customer: my name is matt. my sons 1998 jeep cherokee the tail lights are not working. Everything is working brake lights, reverse and turn signals. I have checked fuses they are fine. The only one I am having problems with is under the hood. #21 & 22 its a 20amp fuse keeps blowing. It might be 20 and 21 can't remember. All I know is I can put a new fuse in it and it will be fine until I turn on the headlights then it blows.
JA: Thanks. Can you give me any more details about your issue?
Customer: I unhooked everything in the back taillights and towing lights. still blows the fuse. #7 & #23 fuses are fine
JA: OK got it. Last thing — JustAnswer charges a fee (generally around $18) to post your type of question to Jeep Experts (you only pay if satisfied). There are a couple customers ahead of you. Are you willing to wait a bit?
Customer: Yes
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Submitted: 2 years ago.Category: Jeep
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1/7/2016
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago
Ron
Ron, ASE Certified Technician
Category: Jeep
Satisfied Customers: 36,855
Experience: 34 year working in the automotive field as a Tech.
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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

If the fuse that blowing is #20, Check the wiring going to the rear Oxygen (O2) sensor. There have been reports of the wiring rubbing on the driveshaft, causing the fuse to blow. Repair wiring as needed. Check this for me and post back with the results and we can work from there if need be.

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Customer reply replied 2 years ago
My main concern is the tail lights and parking lights they are not working.
Customer reply replied 2 years ago
Will that O2 sensor cause the taillights not to work
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

If itd blowing the fuse yes. The fuse blowing indicates a short to ground in the circuit.

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Customer reply replied 2 years ago
Ok will try looking tonight
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

Sure thing, Im here if need be. Good luck.

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Customer reply replied 2 years ago
Well I looked at both sensors could not find a bare wire
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

Are you still blowing the fuse and if so which one is it, 21 or 22?

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Customer reply replied 2 years ago
According to the Internet pic of the fuse box under the hood it's showing a 20amp for O2 sensor relays. It's not label as a number.
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

Okay then go back and unplug all the H02S sensors and see if the fuse holds. If so then start plugging them in one at ta time and see if you can get the fuse to blow, if so then suspect you have a shorted HO2S sensor.

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Customer reply replied 2 years ago
Ok will try that tonight. How many sensors should there be
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

There should be three or in some cases 4. Unplug them all and see if the fuse holds. If so, go back and plug them in one at a time to see if you can determine which one is causing the fuse to blow.

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Customer reply replied 2 years ago
Ok will try thank you
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

Your very welcome and thank you as well.

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Customer reply replied 2 years ago
Well unhooked o2 sensors still blowing I looked again it's fuse #21  21 is showing PCM ignition coil and 22 is showing fuel relay switch
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

So which one are you blowing? Which ever one it is indicates you have a short on that circuit.

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Customer reply replied 2 years ago
The fuse #21&22 under the hood
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

Okay so which one is blowing?

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Customer reply replied 2 years ago
The only diagram I have shows 21 is PCM ignition coil relay and 22 shows fuel pump relay
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

Okay I understand that but which one is blowing?

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Customer reply replied 2 years ago
They are both on the 20 amp fuse one side of fuse is 21 and the other is 22 they are together
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

They can not be on the same circuit, they are for separate circuits . So you saying they are both blowing?

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Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

Okay I have the diagram, in your first question you said the fuse was blowing. In order to point you to the right circuit I need to know which one that is blowing. Is it 21 or 20 or both?

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Customer reply replied 2 years ago
Both same fuse
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

Okay Im not sure what you mean the same fuse, 20 is the flasher fuse and 21 is for the computer and ignition system.

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Customer reply replied 2 years ago
I might be looking at wrong diagram I will take a pic but the pic I sent you 21 and 22 f17 is the fuse that keeps blowing. You know more about it than I do
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

Fuse 17 is the headlamp circuit as well as the data link connector

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Customer reply replied 2 years ago
Ok so what should I do. I was told to replace the light switch. What do you think
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

If its the #17 fuse blowing I would be looking at the tail light circuit. Check the wiring going to the left and right park lights and the license plate light for any signs of a short to ground.

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Customer reply replied 2 years ago
Ok will look
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

If its the #17 that blowing then its likely in the tail lamp circuit.

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Customer reply replied 2 years ago
Ok
Customer reply replied 2 years ago
Thank you
Customer reply replied 2 years ago
Do you have a diagram of the wires
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

See them below.

https://dl.dropboxusercontent.com/u/104923897/Tail%20lamp%20JAn%2010.pdf

https://dl.dropboxusercontent.com/u/104923897/Tail%20lamp%20%232%20Jan%2010.pdf

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Customer reply replied 2 years ago
I re-wired so I thank you
Jeep Mechanic: Ron, ASE Certified Technician replied 2 years ago

Glad to hear you got it resolved and thank you as well. Please take a moment to rate my service so I can get credit for my time, the question remains open for follow up even after doing so, all you need to do is return to this question if need be.

Thank you again.

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Ron
Ron
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Experience: 34 year working in the automotive field as a Tech.

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