75 Duster radio wiring help

One last thing Dingo... So I got everything all hooked up and having the memory problem. I took my main power wire and the acc wire and put them together and connected them to the red wire. It powers on and plays fine just resets every time I turn the car off. Also I was wondering how to "wire the front wires out of the deck in sequence to make it a single channel"? I connected the the 2 front positives and 2 front negatives to the speaker in the dash. Just wanna make sure Im doing everything right and if not I need to fix it right away. Thanks in advance!