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Old 10-11-2004, 10:24 AM
Ken300D Ken300D is offline
Registered Diesel Burner
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
They have a rather weak design for the way that rotating control knob controls the electrical contacts. I disassembled mine completely and tried to clean up the contacts (copper) and bend them a little to make better contact. It was a little better but still flakey.

So, I soldered a jumper across the contacts that cause the time-delayed light turn-off. Now that works solidly. Of course the OFF position doesn't work any more. I can get the light to turn ON in the manual always-on position with a slight bit of switch finesse.

So for me I have my solution with the soldered jumper. I don't need the fully OFF position very often, since I'm not trying to sneak in and out of my car. But if I do then I'll pull the power lead off the light.

[refers to the 1984 300SD]

1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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