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Alright /o/, don't know how much you guys know about car audio but its worth a shot.
I'm doing a side install of a Pioneer Avic z140bh in an 04 Mustang for a buddy. He didn't have the stock wiring harness in the car so I had to run through and solder all the connections to the Pioneer harness. I got the 2004 Ford radio diagram, matched wires and soldered. Got that all done, wrapped it up in electrical tape, turned the ignition and radio failed to turn on.
Anyways about half an hour later of trying to diagnose this problem I found out that there is no constant 12v source wire. The wire that is supposed to be the constant has no power when I test it with my multimeter. I desoldered the connection, attatched the Pioneer constant wire to the car's accessory turn on, turned the ignition and it worked...
Long story short; the constant 12v radio wire doesn't carry any current. Any ideas?