Does anyone have the wiring diagram for a 240? After I installed a tachometer in my 91 240 the radio has stopped working (no Power). I think something may have gotten disconnected and am not sure what. There are two wires feeding power to the unit one yellow and one red (test light). Then there are the 8 sets of speaker wires that run to the harness(4 front + 4 rear). Then there are two blue wires that from the hareness that are not connected to anything as well as a thicker black wire that as well isn't connected to anything that (I'd assume the black wire would be the ground). I had a problem early when the antenna wasn't retracted no power would feed the headunit, I checked and double checked the antenna but no luck, I even used another antenna. No I am stumped. The head unit is a Sony cd, don't know the model off hand.
Thanks for any help.