I pulled out the combination relay and popped off the cover; a visual inspection revealed nothing obvious, so I reassembled it, cleaned off the contacts and put everything back together. Alas, nothing has changed, operation is still intermittent with no apparent pattern. I'm beginning to suspect the multi-switch, although it is possible that the relay is shot.
Is there any way to test the relay?
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Robert Fini
'12 ML350 BlueTec, 87k
'06 E320CDI, 270k
'05 T1N Sprinter 2500/Pleasure-Way Plateau TS, 69k
'97 C36AMG, 313k (son's)
'94 E320T, 249k
'93 190E Sportline LE, 168k (daughter's)
'84 190E-2.3/5spd (Stage Rally Racer)
'66 230 W110 Sedan (Barn Find, Vintage Racer build in progress)
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