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Discussion Starter #3
It's a 2010 wrangler unlimited Sahara. I let it set for two months in my shop. I put new brakes, rotors and new LED head lights. Started it up and the fuel gage don't work. The fuel light and brake light or on.
 

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You can check for possible codes. Maybe a battery disconnect could help. If that doesn't work, there could be a ground issue or an issue with the in tank sending unit that's part of the fuel pump assembly. The brake light may or may not be connected to the problem. Dealing with JK electronics can be a headache sometimes.
 

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Discussion Starter #5
Yes I'm finding this out. I disconnected the battery for one hour, when I hooked it back up the the horn, lights and flashers wouldn't go off. So I disconnected it again. Now it's back like it was. What would be a good brand of code reader to get. This is the first issue I have ever had with the jeep.
 

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Yes I'm finding this out. I disconnected the battery for one hour, when I hooked it back up the the horn, lights and flashers wouldn't go off. So I disconnected it again. Now it's back like it was. What would be a good brand of code reader to get. This is the first issue I have ever had with the jeep.
The problem might not have thrown a code, but you can do an initial check by doing this:

1. To check your Jeep JK Wrangler’s DTC codes, simply insert your key into the ignition, turn it to the ‘ON’ position but do not start the engine. Then, push the key into the ignition cylinder and while holding it in, turn it to the ‘OFF’ position and then back to the ‘ON’ position (3) times straight making sure to end with it in the ‘ON’ position. It is important to keep pushing in on the key to prevent it from catching at the different positions along the way.
2. If you do step #1 correctly, all your dash lights will illuminate and your odometer will show up as a series of (6) dashes. If your Jeep JK Wrangler has any logged in DTC’s, they will be displayed soon after the dashes appear.
3. If your Jeep JK Wrangler has not logged in any DTC’s, the dashes on your odometer will be followed by the message ‘-done-’. Turn your key to the ‘OFF’ position and you will in fact be done.

Another problem could be the battery if it hasn't been replaced. New JK batteries seem to last approx. 2-4 years on average. If you know your battery is good, disregard.
 

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It sat for a couple months. Try a trickle charge on the battery. My reading here indicate the CANOBUS system is sensitive to low voltages in the system.
 

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I agree with h8tspvmnt
Check the battery.
 

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Discussion Starter #10
I drove it for 100 miles at thanksgiving. Should that have charged it enough? The battery is old though. And it was dead after it set. I put a battery tender four three days ,then she fired right up. In June I had to pull two jeeps back to back out of a reavine . It was really hard on my battery and alternator I parked it after that weekend
 
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