Founding Member #2
Join Date: Jun 2006
Location: Orange County, CA
Vehicle: 2008 SLK 55
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John's 3rd brake light module is compatible with both LEDs and incandescent lamps although the 3rd brake light is LED.
You may want to disconnect and re-connect the plugs to the original and see if the 3rd brake light works (perhaps with the aid of a mirror or an assistant).
If the unit (3rd brake light) is bad, IIRC, the whole thing needs replacement. Do a search on the thread on changing out the 3rd brake light to AMG ones, there may be a part number in that thread.
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Pewter(cubanitsilber metallic)/Beige, PIII package, Airscarf, Hands-Free Communication System, Lighting package; Designo Black Leather Cover on e-brake handle(Thank you Bill T), SmartTop v3.x, John's 3BFM, M113 AMG OEM air filters, Modified R170 ant., clear side-markers & front parking lamps w/error-free LEDs, chromed front & rear turn indicator lamps, steel mesh at battery bay cover & cabin air intake, sock-over-seatbelt buckles, belt-loop guide protectors, Lamin-X fog lamp protectors, bilateral rear fog lamps enabled, AMG crest on gear shift knob