i have installed 2 rockford fosgate amps and 6 speakers as a kit. one amp goes into protection mode and the other is fine. the system worked perfect for the first 3 months and now I'm having the problem. i have gone threw 3 amps after checking the wires with a multi meter. and it still appears to be the amp. but the same problem with 3 new amps?? i install it and it seems to work fine in the garage with just the accessories on and with it at idle. but i get a couple miles down the road and the same thing , the amp goes into protection mode. the only thing that seems different is the ohms from the speaker wires from the stock head unit on one side is like 130 ohms ( on the side that works ) and 15 ohms ( on the side that gives me problems).

Optional Information:
Make: harley
Model: fltrx
Engine: 103

Already Tried:
2012 road glide custom. i have switched out amps, only a problem with the one side . i have tested wires everything seems to check out fine.