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Well considering every major motorcycle audio shop recommends grounding to the battery, where should it be grounded? I mean it's not like those guys are competing or anything and want the absolute best sound quality and durability possible.
about the only time any shop worth paying for would advise doing this is when it's a secondary battery specifically for competition purposes and has no other purpose but running an amp in a parking lot. In the real world you should never do this. Tell you what, don't listen to me or your shop. Read the installation instructions from the amp's manufacturer. Find me just one single manufacturer that does not say to ground directly to the frame as close to the amp as possible... just one. Anyway, don't listen to me, listen to Bates and babyboy. They have your back.
yeah, that was read and teedoff and I both suggested he start by checking his grounds. That, and the placement of his pre amp and speakers leads relative to the power runs are the # 1 and 2 causes of alt whine. Not to say it's not something else but that's the best place to start.
edit: and as CoolBreeze suggests double-checking you haven't pinched or broken anything when swapping slip-ons
This is probably the closest response to being correct I've yet seen here. The frame is "almost" the negative battery post for all intent and purpose and is the proper place to ground an amp. Nobody grounds through "bearings with grease" when they ground anywhere in the front of a bike. Even inside a fairing there is a ground strap that ties back to the main ground plane (frame) and bypasses the steer head assembly.
Only problem is what happens when it gets loose? Fewest links in the chain is best.
system contians rockford fosgate 4ch amp kenwood head unit polk audio 6.5 in fairing and polk 6x9 in bags checked wiring all looks good
Originally Posted by hamah
Tell you what, don't listen to me or your shop. Read the installation instructions from the amp's manufacturer. Find me just one single manufacturer that does not say to ground directly to the frame as close to the amp as possible... just one.
Ok, I concede. I don't agree with the premise of the advisory as that is not how grounding works in our bikes (or shouldn't work at least) but fair enough, you provided an example when challenged.