I am having a similar problem with my Boxster, and I suspect the problem is the ballast resistor. All 4 relays are working. I pulled them all, and shorted from terminal 30 to 87 on all 4 relays. Both run fine in high speed, but neither will run at all in low speed. I checked the resistance between terminal 87 of both the high speed and low speed relays, and it was infinity. So, have i diagnosed it properly before I order the resistors?
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02 Boxster
71 VW Karmann Ghia
71 VW Super Beetle
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