cargo switch Tow mirror clearance light power from cargo switch

HickerBasics · February 22, 2018

I installed a set of tow mirrors which have the rear facing clearance lamps. There's a pair of wires for these clearance lamps separate from the rest of the harness. The mirror control power and heat element are plug and play and work fine. I want to use the cargo lamp switch to power these clearance lamps, so that when I turn on my bed light these side light's come on as well. I identified the wire which controls the cargo light at the BCM (Dark Blue/White Strip). It's my understanding that this wire is the switched ground and that the BCM makes the connection to power when the switch is on completing the circuit. Iv'e reviewed several posts in different forum's talking about this. My take is that you tap into the blue/white wire with the ground wire from the led's and provide power to the positive wire via a add a fuse connection from the driver side fuse box. I did all this and it kinda works, It's just a little back words. When I turn on the cargo light my cargo light comes on as you would expect, but the led's on the mirrors stay off. When I turn the cargo light switch off my led's come on and my cargo light goes off. Truck is a 2003 Silverado 1500HD.

Iv'e also see that you can tie into power from the mid-bec as well,just not sure how to do this from the info I've been able to find. Can anyone help me figure this mod out.