› Forums › Car Problems & Maintenance › GMC › Why won’t my 2003 GMC Sierra aftermarket radio turn on?
May 14, 2025 at 6:43 pm
#1398
John
Recheck all your wires….
My guess is your diagrams do not match
If they do radio junk…
Can you put power to the radio and it works
Just main 12v power and ground.
Hows the ground on the “new” radio