tjkadar said:
Originally I had red to red and yellow to yellow and had no power at all. I need to dig a little deeper and find out what gives. I'll wait until its a bit cooler though. Calling for 100+ temps today.
on the 3x20...
Radio Circuit Operation
Function:
Provides power for the radio and clock circuits.
Operating Conditions:
Key switch in the run position for the radio to function.
The clock will maintain time but no display will be visible
with the key switch in the off position.
Theory of Operation:
Unswitched power is provided to the A3 radio by the 052D
Red wire to supply constant power to maintain the correct
time on the clock.
Three switched power circuits feed the radio as itç—´ power
requirements vary with the function selected and volume.
The 157D Pur wire splices into the 157 series wires. The
272C and 272D Red wires splice from the 272 Red series
of wires. These will supply power to the A3 radio whenever
the key switch is in the run position.
The system has one left speaker and one right speaker.
Each speaker has itç—´ own ground circuit to the A3 radio.
Ground for the radio and clock is provided by the 230 Blk
wire to the W3 upper cab ground circuit.
To make a long story short, IMO the easiest way to make it work as designed would be to get the VW Adaptor which connects to the factory connection and splice it to the head unit connection plug using the diagrams that come with each piece...you'll end up with a plug that look something like the harnesses in this pic:
Snap it in, install radio...Done...
