2018 Chevy 3500HD Aux dash switches

arlo

New Member
Nov 19, 2010
14
USA TX NE
I have a 2018 Chevy 3500 HD with aux switches on dash. Where are the wires from switches stored? What color wire goes to which switch? Are the switches on battery or ign?
 

shues

Lifetime VIP Donor
May 21, 2010
10,276
NW Indiana
I believe the guide you're looking for is here: https://www.gmupfitter.com/files/media/photo/836/18_Sierra_Body_Builder_2017AUG31.pdf

The auxiliary switches are referred to as RPO 9L7. As I read it, the wires may be blunt cut (with RPO E29) or terminate in the X61A instrument panel junction block (without RPO E29).

The switches can be configured pairwise to be ignition-switched or constantly powered. This bulletin does a good job of describing the arrangement: https://www.gmupfitter.com/files/media/photo/794/UI Bulletin_110L.pdf
 

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