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If I'm not mistaken it's relays and fuses for the electric cooling fans. That would be from the 05 to 06--on the NBS.What fuses actually goes here and relays
That price is insane. I bought a new one a few years ago from GM and paid around the same price as you.I paid about $25-30 for mine a couple years ago. Looks like folks are getting proud of them these days.. If you can find the part number, that would be the best way to search for one.
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03-06 Chevy GMC GMT800 Truck SUV Underhood Fuse Box Housing (Base / Lid) | eBay
Engine Fuse Box Housing, Includes Base & Lid, Base Cracked Tab (marked Red). Engine Fuse Box. Important notes: Engine Fuse Box Housing, Includes Base & Lid, Base Cracked Tab (marked Red). Model: GMC YUKON XL 1500.www.ebay.com
Sorry just seen this , yes , I was asking about the little aux box on the side of main under hood fuse box it holds the cooling fan relays I believe. I need any info on them and the wiring connectors or harness area ect . I had to rebuild mine with no manual no help at all no power tools but it’s been driving and looking good a few months now and I don’t want to burn something out but I know it’s not right and it’s the gauges aren’t saying anything wrong and now I’ve lost most my DIC area lights and it won’t let me change the options at all or go off if tire pressure monitors needs Reset … they took off the charm site for manuals I was using so if anyone has a one for a 2005 gmc Yukon Denali XL 1500 awd 6.0 please let me know where to get a copy . Thank you any help on the lighting system and pigtails and harness is greatly needed.That price is insane. I bought a new one a few years ago from GM and paid around the same price as you.