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Discussion Starter · #1 ·
Hello,

I am new to the forum but need to get my problem resolved. I own a 2007 Chevy 2500HD Duramax, 4x4, CC, SB Vehicle Ident No. 1GCHK23D37F130823. For the past 2 1/2 years the truck periodically blows the MBEC 1 50 amp fuse that is in the Fuse box under the hood. When blown the two passenger side window, both power seats and seat heaters become inoperative. When replaced, the fuse will last between 1 day to 6 months. Have taken it to two different Chevy Dealerships, once while the fuse was blown and once not. Neither dealership could find a cause.
Do you have any suggestions as to what would be causing this problem and/or how to correct it?


Thank you,
Daniel Spencer
 

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My friend has a 2004 Silverado and had the same problem. I found a wire rubbing on the edge of metal grounding out left of the brake pedal by the parking brake pedal. It was on a white plug coming out of the mbec that has a cover on it. I would suggest looking around under the dash for wires rubbing on metal edges

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**MOVED TO GM ELECTRICAL TECH**
 

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Your issue is definitely intermittent (well duh :) ). Unfortunately, that makes it much harder to diagnose unless it just happens to be broken right when you're diagnosing it. I would also agree with Pikey in that I'd look for cut or chafed wires. Does this issue mainly crop up during certain weather events such as hot, cold, wet, etc? That will also help you get some insight as to the source of the issue.
 

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Discussion Starter · #5 ·
There don't seems to be any pattern to weather conditions. We have on several occasions reframe from using the seats or windows for an extended period only to try the window and find it blown again. Can't find any common denominator.
 

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Past experience stories can be a big help with this type of problem. Like [MENTION=51590]Pikey[/MENTION], and his helpful story, I had a friend with a similar problem, in his case, there was a wire grounding under the power seat.
 

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Discussion Starter · #7 ·
Your Right! That's the problem... way too many places that it could be grounding out. I read some where that one of the electrical motors could be arching. The possibilities are endless. Mean while I have a wife who can't drive without re-adjusting the seat and with winter coming on....can't turn her seat warmer on.....not a happy camper. I will try and check out Pikey's theory tomorrow.
 

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I know that this might sound strange, but when I was looking for my friends issue, I started running my hand over spots where wires went across metal corners, I cut myself on the spot where I found his rubbing.
 

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Yep!! It's all for the good of your Chevy! This problem has one advantage, your wife can not drive your truck, but it is outweighed by the disadvantage of not being able to turn on her heated seat.
 

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Discussion Starter · #11 ·
Your Right Pikey but remember "Happy Wife, Happy Marriage". If I remember correctly.... getting leather seats was conditional only with heated seats. So it's all for the good of our marriage!
 

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Hello, If you pull carpet back at drivers kick panel. you will see harness that comes under sill plate up floor and goes behind a large junction box. if you pull harness up and look next to junction box there metal bracket looks like junction block mounts to it. flip harness over and its cut from bracket. edge of bracket is knife sharp and you put ypur foot right onit. dull edge and isulate. very common on fullsize gm in that body style.
world class ase
bk
 

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Hello,

I am new to the forum but need to get my problem resolved. I own a 2007 Chevy 2500HD Duramax, 4x4, CC, SB Vehicle Ident No. 1GCHK23D37F130823. For the past 2 1/2 years the truck periodically blows the MBEC 1 50 amp fuse that is in the Fuse box under the hood. When blown the two passenger side window, both power seats and seat heaters become inoperative. When replaced, the fuse will last between 1 day to 6 months. Have taken it to two different Chevy Dealerships, once while the fuse was blown and once not. Neither dealership could find a cause.
Do you have any suggestions as to what would be causing this problem and/or how to correct it?


Thank you,
Daniel Spencer
I had a similar problem on my 2010 silverado 2500 crew cab. Your post put me on the right path. Long story short I shorted out a fuse while doing some work by grounding a drill bit against the wiring harness inside the driver door and both passenger windows would not work. There is a 60 amp fuse on my truck that powers the center sub panel (near the break pedal under the dash). When that fuse is blown power seats and passenger windows become inoperable. I removed all circuit breakers (4 of them) from the sub panel then replaced the 60 amp fuse under the hood. It was the fuse closest to the drivers fender and three in from the front bumper. On my pictures you will see that the fuse is yellow and taller than the other fuses. After I replaced that fuse I replaced the four circuit breakers and windows are working again. Hope this helps someone!
Hello,

I am new to the forum but need to get my problem resolved. I own a 2007 Chevy 2500HD Duramax, 4x4, CC, SB Vehicle Ident No. 1GCHK23D37F130823. For the past 2 1/2 years the truck periodically blows the MBEC 1 50 amp fuse that is in the Fuse box under the hood. When blown the two passenger side window, both power seats and seat heaters become inoperative. When replaced, the fuse will last between 1 day to 6 months. Have taken it to two different Chevy Dealerships, once while the fuse was blown and once not. Neither dealership could find a cause.
Do you have any suggestions as to what would be causing this problem and/or how to correct it?


Thank you,
Daniel Spencer
Hello,

I am new to the forum but need to get my problem resolved. I own a 2007 Chevy 2500HD Duramax, 4x4, CC, SB Vehicle Ident No. 1GCHK23D37F130823. For the past 2 1/2 years the truck periodically blows the MBEC 1 50 amp fuse that is in the Fuse box under the hood. When blown the two passenger side window, both power seats and seat heaters become inoperative. When replaced, the fuse will last between 1 day to 6 months. Have taken it to two different Chevy Dealerships, once while the fuse was blown and once not. Neither dealership could find a cause.
Do you have any suggestions as to what would be causing this problem and/or how to correct it?


Thank you,
Daniel Spencer
 

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Hello, If you pull carpet back at drivers kick panel. you will see harness that comes under sill plate up floor and goes behind a large junction box. if you pull harness up and look next to junction box there metal bracket looks like junction block mounts to it. flip harness over and its cut from bracket. edge of bracket is knife sharp and you put ypur foot right onit. dull edge and isulate. very common on fullsize gm in that body style.
world class ase
bk
i have seen that before but was causing other problems. good place to look
 
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