Where to go through firewall for radio amp battery connection
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PrairieDrifter
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Under the seat are drain plugs in the floor. I would sacrifice one of those. Otherwise the only other real hole is by the brake booster and bulk head connector, that wouldn't be very convenient though.
Have to make sure you tie up the cables good.
Have to make sure you tie up the cables good.
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EvilGenius
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You can reuse the wiring hole for the hvac wiring going from the cab to the blower motor. GM used a big grommet down to a small bundle of wiring. You can order a new grommet in the same outside diameter with a larger inside diameter to add your Amp wiring to the existing blower motor wiring routing.
Grit dog
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If the amp is under or behind the seat, snake it up through the cab corner. Clean no drilling
