jonathanspw

All went well! All 4 circuits are live and working on their respective switches! Also got my dash cam hard wired into RPO power in the driver's side fuse panel. Successful day I'd say!

I used https://www.amazon.com/dp/B07TLB9VYX which worked well and fit the connectors perfectly. For the outputs/load wires from X50a I actually managed to fit 12ga wire on the connectors which makes me feel a bit better should I ever have full 30A loads on them. I didn't have too much trouble getting through the factory firewall boot (once I found the dang thing on the inside). If you unmount the x61a then the boot is literally directly behind it with the main harness going through. Relays and fuses come in today so I can test all the way through to my outputs. So far I've only tested that with fuses/relays in place that the relays actually trigger from the switches (just pulled small fuse/relay from elsewhere for the sake of testing this).

Welp I think I found it. According to https://static.nhtsa.gov/odi/tsbs/2015/SB-10089968-2280.pdf (GM service bulletin 15411) it is the 9815 "HI PWR" relay and they are indeed 30A circuits, so I guess that relay can support 30A.

I grabbed a new switch panel (TC, cargo light, aux 1-4) and thanks to the wonderful posts from @TinkeringFox, @Lethal69GTO, and @tha_lildude I've successfully wired it into my factory x50a block. I got partially lucky and even though I didn't have the wires already run to the x48a block, I DID for whatever reason already have an x50a block with the proper terminals so all I had to do was run from x48a to x50a. Now here's my question: what the heck is the part number for the factory relay? It doesn't look like any other relays in the box that will fit the locations for the factory upfitter relays are 30A relays...but I'm also not finding much info on them spec-wise. From my understanding these are 30 amp circuits right so I need a 30A or higher relay? Any help would be greatly appreciated. I was eyeing maybe the GM 9815 "HI PWR" relay but the only docs I can find on that seem to cite 10A but that's probably not even reliable since it's just on an Amazon listing.

3.08 with 34s and seeing about 15 hwy. Bout to go to 4.10 with lew tune.

I have 3.08s right now and I have 4.10s on the way. I'll let you know how it goes.