Cargo lightz

[Htown_LTZ]

So I bought some some aftermarket tow mirrors for my '17 silverado LT. I want the cargo on the mirrors to come on when when my reverse lights come on too. I was thinking of running a wire from the lights and tapping into the reverse light wire. My question is, is there somewhere else I can tap into, like a harness in the cab or a fuse? Thanks.