I just recently bought this from a friend
and I hooked it up right, and i have heavy gauge wires, remote is connected, its getting power because the ground will spark when nicking metal, so its grounding right, but when i start my car neither the green power or the protection light turn on, the fuse is good, and im running two 12" 200 watt woofs, did i do something wrong or was i ripped off, cause it was working for him about a week ago now (he upgraded his system) Thanks in advance
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go with an 8GA wire and see what that does for you because the battery is sending power to an amp but the amp cannot transfer all of that power anywhere without speakers being ran to it if you think 8GA is to small then try running a fuse in with your 4GA
With your multimeter set to DC volts, the black meter probe on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red probe alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.
The head unit probably has 2 control wires. One has 12v when the signal source is the tuner. When you switch to the other sources, the antenna is not needed so the output to that wire is switched off (so the power antenna will go down).
Look for a wire marked amp control or something similar. It will have 12v output any time the head unit is on. Use that one to control your amplifiers.