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I have checked every fuse in the engine bay and dash - there are none that are currently blown.
The rear amp is wired quite simple actually. There are 4 input wires (R + L) from the head unit and 4 output wires to the door speakers (these do NOT connect to the mids and tweets as the person referenced in the link you supplied). The problem is I have no signal on my input wires.
At the head unit (where I soldered in my 4-channel adapter) there are only 4 sets of speaker wires (FR, FL, RR, RL) which is where I wired into. The FR and FL speaker out from the head unit then go to a different connector (D49) where the signal is split with 1 set of wires running to the each set of mids then tweets, and the other set of wires going to the rear input on the door speaker amplifier. The problem is that I didn't touch the D49 connector - and my mids and tweets are working which means they have a signal.
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