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What is your question?
This fuse constantly blows. wehn a new fuse is in the battery is drained. any known problem / solution?
8 Replies
Amazing pulled the wires by the end brake there it was thanks can you attach pics here
The MBEC fuse feeds the right door and power seat circuit breakers which are located in the relay center on the firewall near the break pedal. You can try installing a new fuse AFTER pulling the circuit breakers. If the fuse still blows the problem is between the outside fuse box and the inside relay center. If the fuse does not blow then reinstall the circuit breakers one at a time and see what happens. If there is a fault in one of the circuits feed by the breakers they will trip to protect the circuit, they can however let enough current flow to blow the MBEC fuse. Be careful, if one of the circuit breakers is tripping it will be VERY HOT to the touch. I would suspect a shorted power feed wire under the drivers seat could be causing the problem on your Chevrolet Avalanche.
I had the same problem. MBEC 1 50A fuse blowing. Intermittently. Power seats became in-op and also both front and rear passenger windows would not go up. I found an Orange wire routing from the Underhood Fuse Block, where MBEC 1 is located, to the Center Instrument Panel Fuse Block which is located underneath the instrument panel, near your left foot, to the left of the steering column. The Orange wire was chaffed and rubbing against the bracket as it enters the Center Instrument Panel Fuse Block, causing a short to ground. Look there, you may find the problem.
Thanks for posting, I had the exact same thing on my 2008 silverado 4x4. Found problem thanks to your post.
Found it and fixed it! Had to pull up the tip of the carpet a little bit under where the park brake hits. Turns out it grounded out on a sharp metal bracket under the carpet after all. I found the short by buying a couple of the 50A fuses for the MBEC 1 location. BEFORE putting the huge fuse in, I pulled both the 30A circuit breaker and 25A circuit breaker controlling the power seats and windows, respectively. (As stated by Russ) These fuses are found just to the left of the brake pedal on the floor. There is a plastic nut that screws off so the black cover can be removed. Now you have access to the two circuit breakers. At this point, I now place the 50A in the MBEC 1 location. It doesn't blow. I then go to the floor and place the 25A window circuit breaker right back. Notice the windows work again. As I placed the 30A seat circuit breaker back, I made sure it was dark. As I placed the circuit breaker on the terminals, I see a glow just beneath the carpet. This is how I found the short.
Hey guys I know this post is old, however I had the same problem in my 2003 Tahoe and it was an orange wire coming from the under hood fuse block to the one right next to the parking break. The wire was rubbing on metal underneath the end of the carpet. This was causing a dead short to the 50A MBEC fuse under hood for passenger windows, power & heated seats. Pulled wires out a little, taped and repositioned them. Thanks so much for this information, keep sharing !!
2004 Avalanche 2500 MBEC 1 blown fuse, intermittent. See pics in following link
https://imgur.com/a/a4JyK
5/23/20 THANK YOU Jerryflash32!!! Pictures were perfect. If anyone else is here, you must be having same problem we did. Follow picture link from Jerryflash32 December 4, 2017 posting and see exactly where several of us have same problem to fix. Hints - There is a long black plastic nut holding on relay box cover, about in middle of cover. Look carefully at orange wire, mine was a very tiny spot that wore through its covering, and that's all it took. If you can not find a bad spot on wire, follow lovinGMyChevy on August 29, 2015 post and at least get your windows working til you can find real problem. The 50amp fuse cost me $5 each at parts store, so I ordered 10 online at $1.75 each before finding this post. (i only had 3 left after many hours of guessing and wire harness pulling!!!) Thanks again.
Battery drain 6 hour . Fuse lbec tbc
Did you look at my pics in the above link?
Can you send me the pictures where the wires get shorted in your post that blow the 50 amp fuse please
I'm having the SAME problem! haha But I can't find the short-to-ground that others are finding. I'm probably not looking at the right spot. Any pointers?