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#1
06-08-2006, 06:08 AM
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License Plate Lamps 99 ML430
My license plate bulbs were out. I pulled the lenses off, and the bulbs were good. Jiggled them and got them both to light. Replaced the lenses and as I tightened the screws, the bulbs would flicker or get dim. At full tight, they went out. This happened a few times. For laughs, I replaced the bulbs. Same thing happened.
I found I can keep the bulbs lit by not fully tightening the screws. Not a great solution as I'm sure I'll be getting moisture in there. Anyone else have this problem? 
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#2
06-08-2006, 11:57 AM
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Sounds like a ground problem in the tailgate.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#4
11-21-2007, 08:29 AM
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I found the solution if anyone else has this problem.
The lamps are held in place (when tightened) by cheap clips holding onto either side of the base. If the festoon bulbs are slightly too thick (in diameter) or the glass tube is too long, when the screws are tightened, they cause the clips to open up and lose contact with the lamp base and result in intermittant outages. The problem happened for me when I replaced with generic festoon lamps. I suppose the clips were designed around the dimensions of a specific Bosch (or whatever) lamp. I was able to replace with generics that were a slightly smaller size. Bottom line, it's a cheap design, and disappointing in an MB.
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