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H4 headlight conversion

Electrical and Electronic

Vehicle Information: Model: 911 Carrera; Year: 1987; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 152,000;

I want to replace the existing H5 headlights in my 1987 Carrera to H4. I checked with Pelican (they have the headlights), but a technician told me that due to a change in the wiring harness, their H4 package won't work in a 1987 without modifying the wiring harness. Is there any guidance available that details the necessary steps (or has a diagram to wire in the new harness)? I checked the archives and didn't see anything on point. I also understand that in order to run 80/100 watt bulbs, a relay needs to be installed.Any help would be greatly appreciated, as it's extremely dark here, and there are plenty of deer to avoid!

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