Ford Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
Ford did not install an inline fuse though someone could of installed one aftermarket if the original radio was not in the truck.
Test your grounds and powers to an alternate ground source to make sure there is not a concern with the grounds to the radio. The radio has 3 grounds black and 2 black/green wires. The powers are red/black fuse 28 power only when starting, yellow/black power with the key on or in accessory position fuse 20, light green/violet fuse 29 power all the time. All fuses are under the dash. Can you confirm the fuses have power, I know you mentioned the fuses were good, but we need to see if there is a concern before the fuses.
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There is only one fuse box under the dash on the drivers side and there are no inline fuses in the dash. The fuses under the hood are not used for this system.
There is only one fuse box inside the cab on the side of the dash. You can test fuses with them installed. There are test pins on the face of the fuse to check for battery voltage on both sides or to ohm test them.
Next is checking the wires to the back of the radio to see if all the powers and grounds there are good. If all are good then your new radio is wired wrong, it has a blown fuse or the radio is bad.
Hello again Chris here,
Do you still need help with your Ranger?