I have a 14 FLHXS with a biketronics 2180.14 amp pac SNI 35 line Leveler 2 alpine 6.5 type R in front and just added two 6x7 Rockford Fosgate to lids. Running them in parallel. My left channel is louder than the right channel and wondering if my amp is my be shot or rca cable may need to be replaced, was just in there so I know connections are good. Also sounding like it’s cutting out at times like the alternator isn’t giving it enough amps. Sounds like bad reception if you had the radio on, Brand new battery in it. Flash is 4 Speakers 0 amps 14.0 bin file supposedly the good flash done on MOCO first software. Sorry also fade enabled but AVC doesn’t work . Any help or advice would be appreciated

 

Also did a reset on radio, running 2 nd to newest software update

 

Basic troubleshooting:

Swap rca's at head unit - see if changes side - then issue with Head unit
if stays the same

Swap rca's at amp, see if it moves sides.

if not
issue with amp or speakers.

also check, does amp have seperate gains for imputs? if so one probably higher than the other.

next, try changing speakers to different side of amp to see if changes side for bad speakers.

also check balance on radio, and change rapid amp inputs to pac line level converter.

only difference between left and right channel is way sound is recorded. So just keep moving down the line swapping sides until you hear issue move to other side, then you found the culprit.

 

You should be using the Biketronics BT355 lineleveler and not the PAC SNI 35. The Pac is just a line converter from high to low inputs and the BT355 has filters to help control the crazy eq in the stock Rushmore headunits.
As Ron mentioned start at the Pac by switching RCAs from side to side. If the higher volume goes to the other side you may have to reset the gains on the SNI 35 fo match the output voltage of the line converter.