C5 X7 signal from fuse

[vodnasol]

Hi all, I have added a subwoofer to my car and I need to get 12V to turn on the sub amp when the engine is running. I tried F4 and F7 fuses(with a fuse holder add-a-circuit), but neither worked(0V on the multimeter). Is there another place from where I can get 12V when the engine is running?

My VIN is VF7**************[VIN obfuscated, can be read by forum staff]

[Ross_K]

Assuming this is a C5 X7, G39 in fuse box A is the designated (factory-installed) amplifier circuit - 30A fuse so should give you 360W?

[vodnasol]

I already have ran the main power wire. I'm asking for a place to get 12V when the engine is running for the remote terminal of the amp, which turns on the amp.

[wheeler]

Are you using the original or aftermarket radio?

[vodnasol]

Are you using the original or aftermarket radio?

The original RD4 radio.