I took my stock HU to replace it with the new one. I installed my wiring harness and connected all my wires, but no power. Then i put the stock HU back but still no power. Can anyone point me in the direction of my problem.

blown fuse? Check voltage with a voltmeter

I dont have a voltmeter, do you where canI I get one

check ya fuse panel first, cheapest route!!

Thank you, I found the blown fuse