[importsmasher]

This may be a stupid question, but here goes...I have a 2011 Chevy Express 3500, and recently the right rear brake/turn signal wire got pinched and blew the fuse. I pulled the fuse block cover, and according to the diagram, the fuse in question is #3 (see photos), but there is nothing in the #3 spot. I can't figure out what fuse to replace. What's even more frustrating, the same thing happened right after we bought it (5 years ago), but with the left side, and I replaced the left side fuse at that time, but the diagram says that one is #21, which is also empty! I can't for the life of me figure out which one I replaced previously either. Am I missing something here?

[Johnnygoose]

I've had fuse boxes that were not labeled correctly. If you can get a camera at the right angle you might be able to see which one is blown, otherwise start pulling them one by one.

[Heybuck]

Or use a multimeter to check for continuity.

Switch the meter to the continuity section, one probe at one end of the fuse and the other probe at the opposite end. Get a beep and its a good fuse. No beep = bad fuse.

[importsmasher]

I did pull them and do continuity, and didn't find any bad ones. What's driving me crazy is that I replaced the left side one, and I don't remember having any trouble finding it, but according to the diagram, it's not there either. I was hoping someone else had run across this and could tell me where they found it.

Importsmasher

[Cardo]

Need a better picture of the fuse diagram, but the fuses you are asking about are for trailer lighting, not the body itself. It's possible there is no fuse, but a FET instead. A FET is a field emitting transistor that is in the module in place of the fuse. They will reset themselves after a couple of key cycles once the short is fixed. That's how the current Fords are set up. Is there a second fuse box inside the van? Most newer vehicles have two.

[importsmasher]

Sorry, the pictures are clear on my phone. As stated, I have replaced the stop/turn signal fuse (twice) about 5 years ago. This has been going on for over a week, so it hasn't reset itself.

[74gto]

Number 3 is for your trailer wiring. should be another fuse for truck side.

[importsmasher]

Ok it makes sense that if #3 is just for the trailer, then it would be empty, as the van doesn't have factory trailer wiring. But I'll be damned if I can find the right fuse!

[72projectbird]

Most vehicles don't split the tail fuses by side. They're usually grouped together, such as Stop/Turn/Running lights.

Is there a secondary fuse box inside the vehicle? GM likes to put them on the sides of the dash boards in their trucks.

[importsmasher]

There is one under the driver seat, but the closest thing I found there was the tail lamp fuse. The tail lights work.

[gtohurstjudge]

The fuse in question is in the box under the front seat. Check all the fuses in that box with a test light on both sides of the fuse and you will find a blown one. (Car repair business owner for 43 years) GM puts the turn signal brake fuses in the interior fuse boxes, and the trailer light fuses in the box under the hood.

[gtohurstjudge]

I looked at the under seat fuse box diagrams on my All Data and I believe you are being screwed by an idiot at GM who labeled the fuses on the box incorrectly. F7 is the right rear turn signal brake lamp fuse but it is labeled as a right rear park lamp fuse
by mistake. F27 is the tail light fuse, not F7. In the All Data description chart
F7 is labeled as the right rear turn signal brake lamp fuse, while on the label on
the box it says right rear park lamp.

[importsmasher]

Thanks for that info! I will check the fuses under the seat. Old age must be messing with my memory, cause I would have sworn I replaced a fuse under the hood last time, not under the seat....

[importsmasher]

Ok so it's not f7. I pulled all the fuses under the seat that could possibly have been it, and they're all good. I would never have believed that finding a fuse could be so hard!

[importsmasher]

Ok I tried to get better pics of the underhood diagram. I'm stumped.....

[importsmasher]

Ok I figured it out. Apparently I didn't check every fuse yesterday. It was #72, marked as BCM6. I replaced it and the light works now. Thanks for all the input!

Edit: Not sure how that picture got here lol....

Importsmasher

[gtohurstjudge]

I'm glad you figured it out. for some reason it blew a Body Control Module fuse instead of the fuse for those lights. The wiring on these late model vehicles is
ridiculous. Usually the best thing to do is quickly check every single fuse in all of the boxes with a test light.....only takes about 10 minutes to check them all.

[Simple Man]

Originally Posted by 72projectbird

Most vehicles don't split the tail fuses by side. They're usually grouped together, such as Stop/Turn/Running lights.

Is there a secondary fuse box inside the vehicle? GM likes to put them on the sides of the dash boards in their trucks.

We had a Porsche 944, that nearly every electrical part was separately fused. IIRC, each headlight had a separate fuse. German engineering............