- Joined
- Aug 14, 2007
- Messages
- 7,895
- Reaction score
- 982
- Points
- 113
- Location
- UT
- Vehicle Year
- 1989
- Make / Model
- Ford
- Engine Type
- 4.0 V6
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Total Lift
- 5
- Tire Size
- 33
I don't know what the inside of your radio looks like, but basically what you need to do is override the preamp signal with your bluetooth receiver, so that your radios amp plays the music/calls.
This is how I did it, but my radio is of the newer digital style. Not sure what yours will have
There is also this company, who may make one that works for your dash
https://www.retromanufacturing.com/
This is how I did it, but my radio is of the newer digital style. Not sure what yours will have
There is also this company, who may make one that works for your dash
https://www.retromanufacturing.com/
Finally got around to adding an aux input to my factory radio. I tried the Bluetooth board I bought, but kept having ground noise issues, so I just used an aux cable instead.
I soldered the left and right wires of the aux cable to the L and R #2 inputs(AM Radio) on the preamp chip and ground to ground. This way I still get to use the chips equalizer and balance settings. I desoldered the AM tuner connections so that I won't get any buzzing. So now if I want AUX, I set the radio to AM. FM Radio still works great.
Here's some pics and the data sheet of the chip in my radio. Note - The left and right are shown here as being soldered to the #3 inputs. I switched these later to the #2 inputs, overriding the AM signal.
My phone puts out too much voltage, so I'll have to add a 100k trimmer pot so I can tone it down, but my battery powered 3.5mm Bluetooth receiver works great.
1992 factory radio with added Bluetooth round 2.
I added a step down voltage converter and an isolated 12-5v converter.
This got rid of the ground loop noise.