Hi I'm new to site I'm trying to install power heated with turn signals mirrors on my truck 2008 f150 xlt has factory power the wires are there I tested them but the signals wont work on the new mirrors both of them everything else does well didn't try heat yet can anyone point me in the right direction thank you Matt

 

check fuses and relays. sometimes if the vehicle is prewired but doesnt have that packaged installed they wont install fuses or relays.

 

I checked it has the relay and fuse but still not working are there wires I need to add or change pins thank you

 

if you have a volt meter then start checking at the plugs, relay and fuse to see if you even get power. If you dont have one they are cheap to come by and really do come in handy.

 

I figured it out I cut a wire and for got to reconnect it and my battery died. thank for your help Matt

 

Glad you figured it out.