When do these buggers turn on? is there a separate switch for em?

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

All you have to do is push the washer on the windshield --- then the headlights get washed, too.

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daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
No longer selling Cluster Needles Paint
No longer selling New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more

They only work when the headlights are turned on AND you activate the windshield washer switch!

that complicates things.... my washers dont work.. ah well,

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

There's a separate pump for the headlight squirters so you can check voltage there. Suspect the combination switch if you don't get voltage at the pumps.

Sixto
87 300D

Never hurts to check the fuses either. The olde style bullet fuses used in these cars like to get corroded terminals over the years.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.