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First thing I would do is replace the crappy cables with decent quality ones and give each amp their own earth! First possibly try upgrading your earth cable to a 4 guage one rather than the 8 guage one see what difference that makes.With regard to the noise coming through the speakers, where have you got your earth connected to the car because moving this can help reduce the interference, for example with you saying when you use your lights it causes the interference to get worse I would imagine it's near to the rear light clusters, so try using the rear seat / seat belt mounting bolts as these generally in my experience seem to produce less problems.Hope this is of some use,All the best, Chris.
First thing I would do is replace the crappy cables with decent quality ones and give each amp their own earth! First possibly try upgrading your earth cable to a 4 guage one rather than the 8 guage one see what difference that makes.
With regard to the noise coming through the speakers, where have you got your earth connected to the car because moving this can help reduce the interference, for example with you saying when you use your lights it causes the interference to get worse I would imagine it's near to the rear light clusters, so try using the rear seat / seat belt mounting bolts as these generally in my experience seem to produce less problems.
Hope this is of some use,
All the best, Chris.
