Chopper_Man

22 is the newest GM. The scanner does updates for the newer vehicles.

I use the Autel MK900-BT, does everything I need on all my vehicles.

Right below the sticker you got those numbers from is another sticker with all your trailer weights. Don't forget to add 300#'s for the 5er hitch.

The spare rim is a steel rim with no TPMS sensor.

I'm under my extended warranty, $100 deductible. Part cost me $80. Didn't bother with the dealership.

Even with an isolator, how would you prevent the main battery from overcharging? Chargers leads on main battery > Main battery charged > isolator closes allowing to charge 2nd battery > main battery still on the charger thus the potential to over charge. While it's rare I need to, but on dual batteries I have always charged using 2 chargers with the 2nd batteries ground disconnected.

The front of the camper should be 6" above the bed. Yours looks higher. Also, have you actually measured pin weight at a Cat scale? Specs are dry weight, add all your gear, propane, batteries, etc. Granted, your 3500 should handle it fine, but you'd be amazed how fast it adds up! I plan on bagging mine for my 5er we're buying.

Just a quick followup. It was the trailer lighting module. Part number 13554026. Took about 20 minutes to install. Drop the spare tire, undo the connector, and 2 10mm nuts. Working perfectly now.

Ruled out anything with the trailers (I have multiple). I have a constant 12v on the tail lamp circuit with nothing plugged in and the truck off. Thanks for the reply!

This is absolutely perfect, thank you. I have no trailer relays, fuse feeds the trailer light module directly. Based on the above, it can really only be a shorted light module or a canbus control issue. Rolled the dice and ordered a lighting module, was only $80. Should be here in a few days.

They end at the trailer control module. The diagram Bruce supplied above is missing in AllData.

Thank to both. Looking for a full diagram, not just pinout. I also don't believe is security related as it's not flashing. Great thought tho! I have a constant 12v to the lamp circuit. There are also 2 codes associated to it. B3885 and B3886, left and right tail lamp circuit short to battery. I have the 12v even when pulling the fuse. I have access to AllData at work, their diagrams only show from fuse block to trailer control module. I don't just want to throw a tcm at it without further troubleshooting.

Hey all, looking for a wiring diagram for the trailer harness with the 5th wheel prep. Having a fault with my running light circuit and bleed-thru. Running lights stay on even with truck off. Thanks! -Brian

Fill up's go past full on the gauge. Cannot simply use 1/4's due to that overage.

Yup, 1 on the rear bed, 1 on the front bed and 2 on the floor in front of the couch. Bungees to prevent them from moving.