I installed a new cd deck and a sub and an amp on my boat, which isn't great..a 90 rinker with 4.3 v6. Ever since the battery gauge would bob as music hit on the sub so we got a larger battery. That didn't fix the gauge from bobbing and I'm talking going from the full 12 to 8 or 9. Has anyone had anything similiar when upgrading old boats' audio systems? How have you remedied this? Thanks
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