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!

the deck needs power all of the time to keep the presets and stuff in memory. the main power wire needs to go to a wire that has power when the key is off. the accessory wire needs to go to a wire that has power only when the key is on. you can use a multimeter to figure out which wires have constant voltage.