1970 E fuse box question

[flat6guy]

Hey all. Working on a 1970 911 E. Laying in a new harness from Kroon. The front harness is in and the tunnel harness is in. Started making connections from the tunnel harness to the fuse box and became confused. The black green and black white wires going to the rear lights is supposed to be attached to the power feed side of the box (upper panel, fuse 9 and 10) versus the output side according to Kroon's instructions. I looked at a factory wiring diagram and it also shows the rear tunnel harness attaching to the feed side rather than the output side. In my head this means the rear harness is not protected by the fuse. My instinct is to put these wires on the output side but before doing so, I'd like to know if anyone has a rational reason why the Porsche engineer decided to not protect this circuit.

[tom1394racing]

Here is what I used for my '70E restoration.

[edmayo]

In that instance the wires from the four way flasher may go to the load side without going thru a fuse, but the flasher power circuit is previously fused, so a problem downstream would pop the fuse #2 that feeds the four way switch. At least that's the way I see it.

[flat6guy]

Thanks for the input guys. Ed I looked at the diagram a little closer. I think you are correct that the rear lights are fused through the flasher fuse. Seems odd the engineer would do this but they did.

[gerakroo]

Many more illogical electrical choices have been made by the Porsche engineers. The fact that the power supply of the dashboard instruments, but also the lighting are not protected by a fuse, also remains a strange choice. We make everything as original and always keep the original wiring harnesses as an example. Many things on the Porsche electrical drawings often do not correspond to this. The drawings of the 911 from 1969 are the absolute example of this. There are a lot of mistakes in these drawings.