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Bavsound BMW E90 - Power;Ground Connections for the New Amplifier; Power Wire (Red Wire)

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2. The vehicle shown has a factory installed component present on the passenger
side, but as you can see there is nothing mounted on the driver’s side. Here is
where we will mount our new amplifier.
3. Place the amplifier in it’s location without mounting it, as we’ll now decide on
the appropriate paths for the wiring entering/exiting the amplifier. Ultimately we
will simply Velcro the amplifier to the chassis.
Power/Ground Connections for the new Amplifier:
*Before you make any connections, we must insist on disconnecting the negative
battery terminal from the battery. This will eliminate any chance electrical damage to
the vehicle.
Power Wire (Red Wire)
You’ll want to run the large red wire to the positive terminal of the battery. We
need to first remove the 10mm bolts that attach the metal battery bracket that
covers the top portion of the battery.
Once removed, loosen the 10mm nut on top of the positive terminal itself.