ultrac4

I've installed Xenon HID on my 2006 ML350. I used a power relay wiring harness to bypass the MB's internal lighting circuit. This connects the HID's directly to the battery. I've used the right light to switch the HID's on. However, I've left the left light switch dangling since I'm able to control the HID's with the right. Now I get a message telling me the "left front bulb" is out. How can I get solve this annoying issue?

Thank you in advance for any guidance you may provide.