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90 FLHTC to 92 Ultra sidecar sound system

I would like to get the radio to work in my side car. When I turn the key on the amp in the side car must have power, because I hear a pop out of the sidecar speakers. Which wires do I need to tap into to get it to work? I tried to ask my dealer if a wiring harnes is made for this, but they don't seem to know. The sidecar harness usually plugs into the ultra rear speakers on the bike. But because I have a Classic, I don't have the rear speakers.

"Lights Out"
That is you will have to take the headlight out then remove the fairing inorder to tap into the speaker wires. You should use pin connectors for the Dietz block, the tool for these aren't expensive.
You may want to make up a lead to go back to the battery box vicinity, if you should want to disconect the sidecar. Gas tank removal also needed to properly run the lead. Good Luck