only wires you have to hardwire is the YELLOW power wires and the ground wires.
the red ignition wires are only a TURN ON wire... it doesnt pull much power if any!

 

What you are going to get (eventually) is a fire. Have you ever smelled the smell of burning electronics, and plastic, vinal, foam, paint, carpet, rubber. What you are doing (why I don't understand) is dangerous. Voltage runs in all directions, when it run's into itself.....spark/fire. Let us know how long it work's (if it does) and when the car finally burn's to the wheels, OK.

 

alright skitch ill let ya know, they already do work now its just i dont want it on the same power line so ill try running seperate power. if it doesnt work ill break down and get a different one, right now its working without a problem.

 

There is a reason for the fuses. If any power shorts out the fuse will blow first before it can heat up the wires. If you run it without a fuse then thats where it causes problems such as fires. Fuses are good. And as long as the wires are ran properly and all bare wires are taped you should be fine. I have seen 2 separate units ran like this before.

 

HEY! porkbun gets it! unlike some someone else other than me knows what fuses are. trust me i blew 3 putting the crap together but thats just stupid things i forgot to do before i was doing other steps so i blew 3 of em big deal i replaced em and i use a 25 fuse rather than the 10 stock. it handles it really well actually

 

First and foremost. If you haven't blown the stock fuse guess what? Its not a power issue. If you want to run multiple decks thats fine as long as you understand the following: THEY ARE EACH CREATING POWER WHEN THEY ARE ON!!! If you haven't blown a fuse why bother going to the battery. If you do decide to go to the batt USE A FUSE. So then why are they flickering? Because you are back feeding each unit. No better way to fry a radio then by sending a signal back into the power supply. Ever short your batterey against the chasis of your car? Makes a cool spark huh?? Guess what your doing to the insides of your radios? Yup, sparkin the hell out of the internals.....
Have fun take a picture of the magic smoke genie when it appears for me!!!!