we have a 2006 ml 350 with a battery drain. the license plate light and the third brake light do not stay on constantly or at full strength, mostly dim flicker and off for some time any advise would be appreciated.
i forgot to mention the third brake light has been replaced but does not come on with the brake pedal, however it flickers sometimes with the key not even in the ignition
I agree with Triton. You probably have a water leak which has affected the Rear SAM Unit.
Pull up the large trap door in the cargo area and remove the spare tire and everything else to expose the metal floor. If you do find water, your leak is caused by faulty rear tail light foam seals, part #164 826 15 91 for left rear and #164 826 16 91 for right rear.
Pull out the rubber drain plugs on the chassis floor to drain the water.
If you have an automatic tailgate opening system, also check for water entry at the module and the hydraulic pump.
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