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dunno if you ended up figuring this one out yet or not, but i also use the beatsonic harness and what i did was i ran a wire from the negative terminal on the battery through the firewall and to the unit so it has a dedicated ground. I dont know if this is the proper way to go about it, but it works for me!
I think typically you can just ground it to a bolt nearby under the dash thats on metal, but i like my dedicated wire.
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thanks buddy, can you elaborate more on the "bolt nearby" approach? Where is this bolt?
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