Jimmy P

Hello I’m trying to install a LC2i line output converter to my system to run my subwoofer amplifier. I don’t know if this has already been discussed as i searched and couldn’t find much although i might have been not searching correctly. Would anyone happen to have a diagram to the factory amplifier to tap into which wires to send the signal to the LOC from my factory amplifier? I attempted to tap into the tweeters in the dash and found that they must be isolated because i wasn’t able to get a bass signal from them for my mono amplifier. Any help or advice would be greatly appreciated. thanks, James