Originally Posted by mantra2
I have the BTA850FH. I don't know what loop your talking about, it never came with anything. I just have the plug and the volume on the subwoofer no other connections. It doesn't seem to have a power indicator so as far as i know it could be either one.
The BTA850FH has a different harness, so not to worry. As far as matching your FAST-9999 wires to your headunit, the power wire on some headunits are colored yellow. Consult your owner's manual to verify what wire is the +12V power source. Do not forget to verify your ground wire either.