986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Both low beams are out

1PorscheBoxster986 · 08-22-2019, 07:41 AM

I would inspect the headlight wiring harness to your low beams. Due to aging, the insulation around the wires become brittle and flakes off exposing the wires. I coat mines recently with plasti dip (in can) using an arts/craft paint brush. You will need several coats.

The high beams and low beams use the same H7 bulbs. I would plug the high beam harness to your low beams to see if it works. If it works then you know it's not the bulbs. You already check the fuses but I would check again to make sure you are looking at the right diagram. Your car should come with a fuse diagram. If not, check the Bentley manual for the fuse diagram. Make sure it's the year for you since it varies.

08-22-2019, 07:41 AM	#9
1PorscheBoxster986 A Porsche Guy Join Date: Jun 2019 Location: 0° Posts: 135	I would inspect the headlight wiring harness to your low beams. Due to aging, the insulation around the wires become brittle and flakes off exposing the wires. I coat mines recently with plasti dip (in can) using an arts/craft paint brush. You will need several coats. The high beams and low beams use the same H7 bulbs. I would plug the high beam harness to your low beams to see if it works. If it works then you know it's not the bulbs. You already check the fuses but I would check again to make sure you are looking at the right diagram. Your car should come with a fuse diagram. If not, check the Bentley manual for the fuse diagram. Make sure it's the year for you since it varies. Last edited by 1PorscheBoxster986; 08-22-2019 at 07:52 AM.