Bridging a JL Audio 500/1

Greetings. I am installing a system that was pro installed in my previous car. A JL Audio 500/1 was pushing 2 JL Audio 12w3s. They are already in a custom box, and there is a single pair of speaker wire coming out, so the amp was bridged. I am not sure which terminals to wire to from the speaker box. There are 2 + outputs, and two – outputs, with no designation of left/right. Below the outputs is “MONO OUTPUT ONLY”. On my 300/2, the manual and the amp clearly state which ones to use. The 500/1 manual     doesn’t say anything, so I know I’m missing something. Is this as simple as using one + and one -? Does it matter which? Thanks in advance.

you can't bridge the 500/1 because it has "mono output only" meaning there's only one channel.