Installing a TD-3141 in my 1987 244, after locating and replacing a few blown fuses and regrounding the factory amp, I still don't have any front speakers. If anybody has any info on the wiring out from the 3141, I can re-pin the 9pin harness. Right now all I've left is a black/orange wire that go into a connector (the radio starts scanning for stations when I ground the orange wire, which is hot), a red wire (hot), and a grey wire (not hot).

The '87 harness I have has the front LR ground returns summed together to a black wire that I believe goes to ground (or at least "a" ground). My problem is locating this as well as figuring out what the senders from the radio itself are. Does anyone know if this unit supports extending the power antenna?

Any info would be much appreciated.