I asked the same thing answer equal in the trunk any bolt strip the paint and add a metal washer and WA-la you have a ground.
The 2005 Saturn L300 does not have a dedicated factory ground point in the trunk, but you can create a reliable ground by securing your amp's ground wire to a clean, unpainted metal surface on the car's chassis. Look for a bolt or a screw that can be used for this purpose. Make sure to sand away any paint or rust to ensure a good connection. Alternatively, you can run a ground wire to a common grounding point in the front of the vehicle, such as the battery or a grounding point near the engine.
The Chassis is the ground.
your amp will ground in your sound system, or through your power adder which rock.
The recommended ground wire size for a 100 amp sub panel installation is typically 8 copper wire.
The recommended size for a 50 amp ground wire in electrical installations is typically 10 AWG (American Wire Gauge).
The recommended size of the ground wire for a 60 amp electrical circuit is typically 10 AWG (American Wire Gauge).
Since the resulting short circuit would be outside the amp, it WOULD NOT blow the amp.
The amp will lead a dull and empty life.
Positive post of capacitor is connected to the heavy amp cable. The ground terminal (or case) of the capacitor is connected to the car's ground or a ground wire that leads to the car's chassis. That's it.
A #14 wire will do fine for grounding a 20 amp device. That is the size of the ground wire in a 2 conductor # 12 wire building cable.
you can ground it right to the frame. just find a bare spot and put a screw with the ground wire
The ground wire in a two or three conductor #12 cable is a #14 bare ground wire.