Trying to install an Alpine MRP-M500 and a 12" Type-R sub.
I have the power, remote and ground wires all setup and working correctly, however I am having issues with the speaker input. I tapped for the signal at output for the door sub amplifier (like outlined in this install: 2012 Mustang Shaker 500 Add A Sub Install - www.Evilcartman.com ). I initially tried to use the speaker level inputs on the amp, but they were not working, so I tried to hook it up to a LOC and try it with the RCA inputs and it still would not work. I double checked all the connections and all the power lines were correct. I then checked the signal wires and realized I tapped the wrong wire at first (tapped brown/blue rather than blue/brown). Tried it again, still nothing. Now I decided to troubleshoot the signal wires by plugging the RCA's into a powered home stereo sub. One RCA works, the other doesn't. I checked all the taps and they all look good and I can't think of anything else that would interfere with the signal from just the one side.
The sub and amp are both in working condition (amp is brand new, sub is used, but I listened to it before I bought it).