Chmsl 3rd break light fuse keeps blowing.

[DvdFish]

Hey guys just wondering if anyone has experienced this problem as I can't find anything on it. 

 

Recently noticed my 3rd break light not working and found the fuse blown. Fuse #38 I believe a 10a fuse in the box under the hood on my 2014 High Country 1500 5.3.

 

Well I replaced the fuse and as soon as depressing the break the fuse blows again. I kept replacing fuses working up in amperage until I got one that would work without blowing, a 30a.

 

I'm not comfortable with it in there, is there a chance of overheating wires or any possible electrical problems if I leave the 30a in place?

 

I've tried regularly 921 bulbs in the 3rd break light and took the chance on a Sylvania led 921 hoping it might help but no avail. 

 

Any idea what might be happening?

Thanks

[64BAwagon]

You have a short somewhere in the circuit, replacing the fuse with a bigger one will ultimately destroy the wire from the power source all the way to the lamp and may cause a fire.  You will need to have the circuit diagnosed and please remove that 30a fuse until you can get it repaired. 

[diyer2]

WOW

Not the smartest move. Circuit is designed for a 10 amp fuse.

[It's Tim]

4 hours ago, DvdFish said:

Any idea what might be happening?

Is the bulb socket corroded?

[DvdFish]

 

6 hours ago, It's Tim said:

Is the bulb socket corroded?

Tim no the socket isn't corroded and it doesn't appear to have any of the typical moisture problems these trucks have been known to have.

7 hours ago, 64BAwagon said:

You have a short somewhere in the circuit, replacing the fuse with a bigger one will ultimately destroy the wire from the power source all the way to the lamp and may cause a fire.  You will need to have the circuit diagnosed and please remove that 30a fuse until you can get it repaired.

The fuse isn't in there I wasn't comfortable with it. Posted here for y'alls opinions and thank you for guys for the replies. Any idea what might be causing this or where in the circuit there could be a short? 

 

The truck it bone stock besides led reverse and license plate lamps.

[64BAwagon]

Try to find the route that wire takes to the back. I have seen a number of trucks with wiring issues due to corrosion and chafing under the sill plate on the door, especially if the door gasket isnt in good shape. I would check the socket very carefully also, I have chased a few shorts when the socket looked okay but was ultimately the problem. Lots of places for a wire to get rubbed through. 

[DvdFish]

Months later finally I have a response and what the problem was, thank you guys.

 

Failed inspection today...I had completely forgot about all of this. I had given up after I couldn't find anything as well as a couple of the local mechanics.

 

Anywho, failed inspection and went looking again. Found a bundle of wires above the spare tire coming off where the trailer connections are. They were sip tied up to the drivers side break light and cut/bare ended. One of the wires had worn through and was bare wire on the frame.

My only guess is that whoever owned the truck before me had installed a camper shell. I cut it all out and heat shrinked anything I found open. Wish I'd have taken before photos.