Well I tried to ground everything like was suggested in some other threads. But everytime I tried to turn it on, it blew the fuse that I connected between the inverter and battery.
I narrowed it down to the inverter's ground.
Right now, every ground is connected to the inverter's ground except the amp. The amp's ground is connected to the vehicle body.
Preamp's ground is connected to the inverter ground
PSU's body is connected to the inverter ground.
Carputer's body is connected to the inverter ground.
A 3-pin switch with DC LED's ground is connected to the inverter ground.
But once I try to connect the inverter ground to the vehicle body, the fuse blows.
And then there's another problem. Its regarding the noise. I played around and noticed that there is no noise if I dont connect the RCA's coming from the preamp to the RCA's coming from the carputer (duh).
But if I connect just the RCA ground of the preamp to the RCA ground of the carputer, I start to hear whining.
I then took out a multimeter and measured between the preamp RCA ground and found:
Resistance : 28 mOhms with power off
Current : (dammit I forgot but it was around 2mA or microAmps)
Are these readings right? In my opinion it should be around 0 because its ground, but I really have no idea.
If this isnt right, do you think something is wrong with my setup?