Date registered: Nov 2006
Vehicle: '84 300DT, '97 S320
Location: Fayetteville, GA
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With the mirrors folded back (if you dare try to move them there) you can probably see enough of the wires to determine if insulation is coming off. Mine was, but the only symptom was the mirrors did not always go into the memory position. If you can't see, then you'll have to remove the assembly from the door, and then the plastic cover from the metal guts.
Have at look at my DIY too.
When we bought our 140, the left mirror's "dimming fluid" was leaking and you could not see much reflection in it. Being a little low on cash for awhile, I opted to just replace the glass, and the less expensive one, which was not the same as the orig...there are two kinds I know of: 1) heated 2) heated & dimmable . Our orig was #2. The glass I got was #1. The connectors are different. Therefore the "heated" could not work...but at least I could see who's behind me.
I coated the wires when I replaced the glass.
Eventually, after much searching for just the rubber seal (both sides were deteriorated a lot) that goes between the assembly and the door and not finding it, I was in a position to buy the mirror new (didn't need a new outside shell) and replaced both sides after about 6 months after coating the wires. After 6 months the coatings were holding up pretty well, but needed a little touching up.
Cheers - DH
'73 220D White "White Knight" ('77-'06, 240K mi; floorboards rusted; gone to MB Heaven)
'84 300D Turbo Maroon "Raspberry" ('95-present, 375K mi; daughter named him)
'95 Merc Villager "Blueberry2" ('00-present, 252K mi-2nd engine-tip of crankshaft broke at 170K)
'97 S320 LWB Black "Ebony" (2010-present, 217K; bought at 204K mi)
'07 Dark-Green GMC Yukon Denali "Jade" (Added Apr 2011 - 104K)
Last edited by MB220D300D; 08-10-2012 at 08:52 AM.