I found lots of posts on this topic, but conclusions were not always the same. Some conclusions on radio wiring provide also conclusions on suppression wiring and items, but those are contradicting conlcusions reached in topics on suppressioin wiring and items.
So I wanted to suggest a wrap up for you to confirm or adjust (for selfish reasons, but also for all fellow members).
Let me give it a try (modified after Tyler's input and Hans' input)
1. If a car was ordered with a radio, it came with factory wiring (a red-green wire in the harness with power after position 1 of the ignition key, originating from R connector in the ignition switch, circuit 30 extension, not fused ) and the radio was dealer installed in many locations due to tarriffs and bands differences (which might have had consequences of not following the instructions precisely) and with the suppression kit. This radio installation included a fuse box and a wire back through the bulkhead grommet to the radio. On wiring diagrams we do not see the fuse, just red-green wire from R to an optional radio. Correct?
2. If a car was ordered without a radio, it came with wires in the harness, tha's it.
3. Then there are codes 531 to 536.
531 - automatic antenna (with a radio) - I guess the second wire was taped in the harness and put through the fuse box at the VR and antenna was connected to the radio. So I suppose there was another wire coming out form the harness near VR with premanent power supply, went through the fuse box at the VR and back inside through the bulkhead grommet. Correct? I am not sure where this wire takes the power from.
532 - automatic antenna without the radio - here I would suppose I would have the wires in the harness for a radio (as in point 2) and also wires for the antenna as in option 531. Correct?
533 - suppression kit without a radio - I understand you would get all of the components that are on the list we have, but that was changing over time as the radios were less and less susceptible to interference. I htink the fuse box at the VR is not there (I think Alfred was posting the parts list, cannot find it now, sorry if my memory does not serve me well)
534 - manual antenna - that is an easy one
535 - it is 532+533 - embracing sum of the components, I suppose
536 - it is 534+533 - embracing sum of the components, I suppose
My selfish reason for this wrap up is: my car was ordered with 532. Should I have the fuse box next to VR or not? Should I have any wires in the harness for the antenna?
I was hoping there is a pattern in the above and that we can nail it for future generations.