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The NSS switch isn't outrageously expensive. If it's anything more than corrosion on the contacts, just replace the unit. You don't want to be stranded at the worst time!
Mine on my '86 300SDL finally died 2 years ago -- after 16 years of being sprayed with salt water from our Canadian winter roads. I got it to work intermittenly but it scared me that I'd be 250 miles away and it would screw up again!
Neal
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'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi) SOLD
'07 S550 4MATIC 235,000km (146k mi) SOLD
'07 GL320 CDI 4MATIC 348,000km (215k mi)
'13 GL350 BlueTec 4MATIC 170,000km (105k mi)
'14 SL550 72,000km (43k mi)
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