Batboard

HI,
I have an MTVA NTN-1340C with Control cable and 1322B box. I need to set this rig up as a test unit in the shop. My question is on the power cable that goes from the MTVA to a power source. The power cable I have has a Molex end from the MTVA. The other side had a molex as well. However, I don't have that power supply unit that serviced that connector. I wanted to just cut that molex end off and feed power from my Astron. The power cable has four leads; Braided ground, Black Wire, Red Wire and a Blue Wire. The molex also had a red wire Jumpering two molex pins. Without a schematic, I am not sure of the input voltage and what the wire assignments are. So, anyone worked on one of these? I would assume 13 volts. As it is , I can power up the unit and it keys, but only 5 watts, so obviously the Control/Amp unit is not stepping up the power. I really don't want to mess with the blue wire until I know a little more. Any help is appreciated.

That molex connector is for the amplified speaker(HSN1006A). The black wire is ground, the red wire is +V for the audio amp and the blue wire is audio input to the audio amp. The red jumpered wire I am not sure about. The holder unit(NTN1340C) gets its power through the RS232 like cable from the NTN1322B unit. The NTN1322B unit gets wired hot from the traditional motorola power connector and the yellow wire on the RS232 like cable goes to ignition.