Adding floor lighting to a 2024 HD

64BAwagon · September 18, 2023

I did not use a "harness" I was able to source a molex connector from a 2024 HD and used that one wire for my positive. I have found them on E-bay and I think the original post about the sill plate mod had someone involved in selling them. I am not sure the dealer could or would source one for you. Mine came from a harness that was replaced and we depinned one connector to source the pin. Keep in mind that this wire is small and would not support a load any greater than a couple of LED's (I don have exact specs). This circuit also will dim the same as the rest of the dome lights. It would most likely cause a fault if used for anything more. The 24's are a whole different animal than previous years and are very fussy electronically. GM has a very low tolerance for warranty work on trucks that are modified in the electronics.

I was told that the GM upfitter site has instructions on best practices when adding things to this truck. My source told me that if those are not followed and a vehicle is presented for warranty it will almost certainly be denied. The ONLY reason I went ahead with this mod is because there were specific instructions in the document and I followed them.

Scott

Kerry Pulaski · September 22, 2023

The wire harness is NOT available alone from the Sill Kit. So looking at the schematics for the BCM X1, the Pin connector used is Terminal Type I, p/n: 19370262 Terminated Lead, called a Splice Wire in my GMC dealer inventory.

Shows a pkg. of 5ea. on gmpartsdirect.com. Dealer will sell them individually.

Scott thanks so much !! Agree the '24 wiring system is very complicated, and the BCM can be easily damaged, as transitors control the lighting etc. Here is a pic of the p/n 19370262 Molex wire lead I picked up yesterday at my dealer.

The X1 connector is really buried next to the firewall. Need to practice removing one closer to the dash, as a 1st. timer, before trying to pull X1.

What voltage did you measure on this Pin 1 in X1 ? Is it the same 5.6 vdc. I found on the Map Light LED, that also theater light fades up/dn ? Also your under dash Led's look quite bright, I tested one KC Cyclone that draws .4 amps, on that map light feed,and not so bright. The KC's are rated 9 to 16 vdc.

Kerry Pulaski · September 22, 2023

2 minutes ago, Kerry Pulaski said:

The wire harness is NOT available alone from the Sill Kit. So looking at the schematics for the BCM X1, the Pin connector used is Terminal Type I, p/n: 19370262 Terminated Lead, called a Splice Wire in my GMC dealer inventory.

Shows a pkg. of 5ea. on gmpartsdirect.com. Dealer will sell them individually.

Scott thanks so much !! Agree the '24 wiring system is very complicated, and the BCM can be easily damaged, as transitors control the lighting etc. Here is a pic of the p/n 19370262 Molex wire lead I picked up yesterday at my dealer.

The X1 connector is really buried next to the firewall. Need to practice removing one closer to the dash, as a 1st. timer, before trying to pull X1.

What voltage did you measure on this Pin 1 in X1 ? Is it the same 5.6 vdc. I found on the Map Light LED, that also theater light fades up/dn ? Also your under dash Led's look quite bright, I tested one KC Cyclone that draws .4 amps, on that map light feed,and not so bright. The KC's are rated 9 to 16 vdc.