[memotronics]

I had a customer that replaced the turn signal incandescent with LEDs in his 1968 912, and purchased an LED-Flasher to go with that. The issue that arose was that when he turned the stalk to the left or right, all 4 corners would flash.

I looked at the wiring diagram and determined that this was likely due to the incandescent indicator bulbs in the tachometer cross-feeding to the other side.

After looking at the diagram some more, I cannot quite understand the design decision, can someone enlighten me on the following:

The in-dash indicator bulb for the RIGHT side is wired to the LEFT front/rear turn bulbs. Vice versa, the in-dash indicator for LEFT is wired to the RIGHT front/rear bulbs. The "other ends" of the indicator bulbs are wired to the pilot-terminal of the flasher. If I interpret the intent correctly, this means that when I turn the stalk to the left, then the right-side turn signal bulbs are used as a ground for the indicator, and vice versa.

My question: Why didn't Porsche wire the left indicator to the left turn-signal bulbs and the right indicator to the right turn-signal bulbs, and just ground the turn-signal bulbs at the tacho? And not even bother feeding those indicator bulbs from the flasher ?

I have a feeling I'm missing something.