Willswilly

Also where are you getting your relay pack. I would like to order one.

This is the plug on the back of the switches. Where do I tie into the wiring?

So the wiring goes from the box to the lights that is the easy part for me. The part that I am having trouble with is from the relay box to the switch.

How do I get the plug apart to add the new wires

There are 7 part numbers for the wiring leads. So if I want to use all four Aux switches I have to order a set of 7 for every switch and then a GM relay for the fuse panel. Correct??? Or call me 314-791-3249

OkK still Ned some help. I installed the upfitter switch. All exciting switches work. AUX 1-4 light up when toggled. I went to the junction box and located pins ,4,14, and 20. I installed a fuse in slot 22 for upfitter switch 1 and I go nothing at the junction box. I tried both positive and negative with the test light on pin #1. What am I missing? Should I get some indication with a test light?

I’m still not sure. Myself. The post was not as clear as I need.

Thanks that is exactly the switches I need. Went the the GMC shop and asked them for this bank of switches and they could not look up anything without a vin for a vehicle with the right switch bank. Not like the old days when a parts guy knew his parts.

This looks like a lot of technical work. I have a 2016 will 3 switches now. Traction control cargo light and engine brake. I want to go with the 7 switch you showed in this post. Does each switch have its own plug or is a group one plug system?

Where can I get. The factory up fitter switches for my 2016 GMC 2500HD