A few things to try.
Check the cable on your Vegas to make sure it's
in all the way.
Do the same at the Equinox.
Test (all) your lights.
Get some contact cleaner at autosupply, hardware, Walmart,Amazon.
Get a multimeter less than $20 while you're there. fyi, they are
much easer to use than they look
Liberly spray all 4 connection points, connect and disconnect the cable 3 or 4 times.
Test your lights.
While working on the cable carefully check it and the connectors for damage, visible wires.
Best of luck and let us know