Engelbert's Porsche 911 SC - Intrument & Headlights Upgrade DIY
I did the H4 upgrade on my 82 SC. I used a typical wire diagram, which made most sense and it is easy, since there are no additional wires to run. I had 2 of the sockets with cable and relay sitting, a left over from another project.
I got these parts from Parts-Express
Socket
Relay
The cables have the following colors:
30 Blue, 85 White, 86 Black, 87 Yellow,
The red cable can be removed, since it is not used. Connecting the blue cables + 30. To be connected to the battery.Disconnected the yellow (Low Beam) and white (High Beam) from the fuses. I marked the relays L and H. Connected the black cable of each relay to the yellow and white cable, which was disconnected from the fuses. The yellow cable of each relay is connected to the fuses, and the blue cable to the Battery + 30. The white cable is ground, and I just connected it the one the fender bolts. The nice thing is that the cable which come with the sockets were long enough. The car looks happy now.