Wiring Diagram for Cargo light switch

1999 CHEVROLET SILVERADO
125,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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JPMG
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I think my 1999 is a cross over. It is an OBS and has internal parts stamped 1998 etc. So it is a bit odd.

I plan on using my cargo light switch as just a switch to turn on the cargo lights and bed/rear lights.
Right now there are four (4) wires from the switch and the cargo lights only come on when the dome lights are on. All I want to do is use it as a switch to turn on the cargo lights, and send a signal to the relay that controls the cargo bed/rear lights. This should be independent of the dome light being on.

Do you have a easier option that to remove the third brake light and do a circuit test to figure out which wire goes to the cargo lights? Plus will I run into problem with the BCM if I alter this switch?

Many thanks!
Oct 5, 2015 at 8:50 PM
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WRENCHTECH
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You can forget that idea. This is not just a simply switching circuit. All those lights run through and are controlled by the Body Control module. https://www.2carpros.com/images/external/79271147.jpg.gif
Oct 6, 2015 at 2:19 AM