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Just picked up a new RetroSound stereo system for my '78 F250 and was wondering what wires need to be spliced together from the new harness to the existing one in the truck. There is a yellow/black wire in the truck which is the 12v switched/hot-in-acc wire for the old AM radio. I believe this wire gets spliced with the red wire on the RetroSound harness (which is labeled ignition/acc connect to 12v).
Am I correct in believing that the red RetroSound wire goes with the yellow/black wire in the existing harness?
Additionally, I am using the quadraphonic amp which has the yellow constant 12v and black ground wires already attached. What is the role of the blue/white remote amp turn-on wire on the new RetroSound harness? Does that blue/white wire get attached to the existing yellow/black wire too?
Any additional information would be much appreciated, thanks! New harness Old harness with black/yellow wire
Hold up, be sure that BOTH those wires in the green connector are not BOTH hot! Usually the radio gets its ground from the mounting bracket and the stud on the back side. You can see the bracket in your pic. I think that is yellow/BROWN... multimeter time.
Also I think there is a power source when you have a digital AM/FM to save the presets..... So connect carefully. Some notes I found below.
"The OEM radio was powered by a GREEN 2-terminal pigtail. YELLOW with a BLACK stripe is switched power, BLUE with RED stripe is dash illumination. Do not mistake the BLUE with RED stripe wire for ground. The OEM radio grounded through its mounting chassis. The speakers were connected over a separate pigtail."
"Ok I looked behind the glove box and found a connection the goes off the green and yellow. GREEN with YELLOW stripe wiring is hot-at-all-times power for the courtesy lamp circuit. There is a yellow 3-connector pigtail behind the glove box (which also goes on to power the cigarette lighter and glove box light). It's not the stock radio wire because the stock radio didn't need hot-at-all-times power (EXCEPT the factory digital AM radio for clock memory). solid black—power blue with red stripe--dial light black with gray dashes—ground orange with green dashes--right speaker white with green dashes--left speaker"
"meangreen92 with some words of wisdom that I had to save for others to see. This covers an issue of blowing a fuse in the fuse block (top R/H #2 in the diagram) when you connect an aftermarket radio to the OEM connection improperly. And BTW the OEM connection is the green square plug."
""Improper radio installation, the common mistake is to use the blue-with-red-stripe wire as a ground, since it shares a connector with the yellow switched-12V+ wire, and that will blow that fuse the first time you turn on the lights and hit the brake. That blue-with-red-stripe wire is for the dial light in the original factory radio, so if it gets grounded, it will pop that fuse."
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