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I am doing the UltraNutz (4) MM651 and SS 4.520 build on my '13 Ultra Limited. I am to the point where I am hooking up the amp, but the 4.520 I received doesn't have the same wiring harness explained in the instructions:
9. Connect the left crossover black/white wire to the green/black wire on the PN4.520D speaker harness.
Connect the left crossover black wire to the green wire on the PN4.520D speaker harness.
Connect the right crossover black/white wire to the violet wire on the PN4.520D speaker harness.
Connect the right crossover black wire to the violet/black wire on the PN4.520Dspeaker harness
I just hooked mine up tonight. I assume that you do not have RCAs on the HU, that is why you are wiring it up. The amp sounds great. I am looking to replace my Polk Audio DBX with some MM series. I bet your system will sound even better.
I ran into the same issue when I did my install last weekend. Basically you have to solder leads from the wiring harness where you cut the rear speaker wires to make them long enough to get to the amp then connect the wires individually to the amp itself. I got with UltraNutz and he said there was a harness change made by the amp vendor since he make his instruction sheets.
Ur on the right track the old style amp had a harness coming out by the power and ground and remote input, the newer style(yours) has a block style, so you have to run the crossover wires directly to the amp. The harnesses in ur first pic is the high level input from your head unit and the bulky block on the other side is where u run ur crossover to that side is the output side. On your crossover wires the positive is black w/ white stripe and the negative is black, so if ur hooking up your right front speaker run the crossover wires to the rf output of the amp and left front crossover wires to the lf output and so on
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