Exactly right, ground loop issue. Nowadays probably not so much of an issue with isolated grounding in newer electronics, but back in the day when I learned to install, it was a big no-no. Just something that stuck with me to this day. better safe than sorry, I say.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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