Radio: muted when in Drive/Reverse


FillMarr

Member
Joined
May 16, 2016
Messages
44
Reaction score
1
Points
8
Vehicle Year
2003
Make / Model
Ford ranger xlt
Transmission
Automatic
Hey all,

I’ve done some investigative work here. The radio works only in Park and Neutral, whether or not the truck is on or just the ignition is on. Problem is, the sound gets muted when in Drive, reverse, or in gear. The radio/screen/clock stays on, but sound is muted.

I noticed that each of the 3 radio fuses have power as they should (one always, another while ignition is on, another only when cranking).


Interestingly, there IS sound in Drive when I ground fuses 21 and 22 manually via my test bulb....so, prodding either fuse with the tip of the tester, while the tester itself is grounded via alligator clip.


So that means what? That my starter relay needs replacing? That my sensor relay on my tranny needs replacing? I hear people cut a red wire/black stripe at the back of the radio, but I’d rather do this right.


Thanks!

Phil


Ps- truck works perfectly fine otherwise. 175k miles, 2007 xlt, 4.0, automatic, stock radio (not tremor), vacuumed carpet. Some codes from my obd2 scanner seem irrelevant but are attached:

View attachment 31277
 


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