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I have a Helix B4 precision some where in my damn garage that kept blowing a fuse after I installed pullies on my Z . I'll see if I can find it tonight.
i have an eclipse old school 4 channel amp that is white...2 of 4 channels work
also have a hifonics old school amp 4 channel same symptoms
also a jbl gto 4 channel amp with same issues but 2 of the channels that dont work have to do with the on board connection from the rca to the board...each amp weighs 20+ lbs...if you repair the jbl ill give you the other 2...the jbl needs the rca's reconnected back to the board