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Old 04-12-2010, 05:56 PM   #1 (permalink)
lost26
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MBEC fuse draining battery?

Our Tahoe battery keeps draining over night so I took some advise I found here and found the fuse it seems to be coming from. My question is..where do I go from here? When we unplug the MBEC fuse the ammeter light goes out. This fuse seems to control quite a bit... I know its a gasser but you guys have solved all of my Duramax problems so this is where I go...Thanks in advance
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Old 04-13-2010, 06:55 AM   #2 (permalink)
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Did you check the mbec panel to see what aftermarket items are getting power from there ? That electrical panel typically is a source for people to pick up 12v power for add-on accessories. I don't know where it is for sure on a Tahoe but on the pickups it's right next to your left foot,it's the panel where the trailer brake controller gets plugged in. I imagine the Tahoe is in the same place.
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Old 04-13-2010, 11:41 PM   #3 (permalink)
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what is mbec?
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Old 04-14-2010, 12:08 AM   #4 (permalink)
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Quote:
Originally Posted by wreedLBZ View Post
what is mbec?
mid body electrical center

Installing boost & EGT on a LMM post #4
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Old 07-22-2010, 03:17 PM   #5 (permalink)
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The MBEC also has a couple of heavy wires going to the electric seats. It runs under the floor mat under the drivers feet. It has been known to rub the wire insulation off enough to blow the 50 amp MBEC fuse. Its worth a look
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Old 07-22-2010, 04:39 PM   #6 (permalink)
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Isn't the MBEC fused through the interior fuse panel?

I can't remember exactly, might be worth looking at. Just make sure to hold the dome light button down.
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Old 07-22-2010, 05:10 PM   #7 (permalink)
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the panel is under the hood marked MBEC on drawing, mine is about 1/2" square (red) plastic, clear top $4.49
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Old 07-22-2010, 05:20 PM   #8 (permalink)
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On the HD's it's under the kick panel by the parking brake.
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Old 10-25-2010, 03:21 PM   #9 (permalink)
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the MBEC is located as they are saying on the left by the parking brake, the 50A fuse for it is under the hood in the power distribution fuse box.

I only know this because I am trying to find out why I am blowing the 50 amp fuses for this. I will be looking under the carpeting tonight. Is there a way to test the relay's in the MBEC, or something I should be looking for in the MBEC?
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Old 10-25-2010, 05:22 PM   #10 (permalink)
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Ok I read about testing relay's, there is one in the center of the box. What are the skinny metal things marked 30 + 25? I have disconnected my electic brake controller if it is what was causing fuses to blow.

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