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That is just the fuse protecting the 10awg wire at the battery just in case the wire is comprised. there is 2 other fuses at the radio that are 25 amps





I have been told that you need to run the negative to the frame of the car

and i have always done this with "audio equipment". when i did a few car stereo installs i did a negative to the battery and that made a bad ground loop, then installed it to the frame and never problem..


The Negative connection to the radio is fused but what about the coax to the stud mount that is in contact with the frame of the car? so that would in turn negate any fuse on the Negative connection. right?