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1993 300CE Cabriolet (mine) ; 1994 E320 Wagon (wife's) ; 1990 Benz 300E 2.6 (son's)
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Discussion Starter #1
so, 1990 300E 2.6, aka the Ratbenz...

right front fog wasn't working, so I got some more yellow H3 bulbs, and tonight opened it and swapped lamps. oops, still doesn't work, and the bulb I pulled is 0.5 ohms and looks 100% AOK

I'm looking at the wiring diagram, and AFAIK, one wire goes into the N7 lamp failure box, and 2 wires come out and go directly to the two bulbs. ugh.

so this means my problem is probably in that black box N7 ?
 

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W124
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4,740 Posts
Has anyone been doing any other work on the car lately? I wouldn't doubt N7 is fine but the problem is downstream. (If one lamp works, doesn't that shift the probability of N7 failure down to being more unlikely?)
 

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'95 E300 DIESEL, '91 600SEL, '92 600SEL
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I'd say the problem is more likely to be a ground issue as opposed to a problem on the positive side (switch, relay, etc.)
 

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1993 300CE Cabriolet (mine) ; 1994 E320 Wagon (wife's) ; 1990 Benz 300E 2.6 (son's)
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6,829 Posts
Discussion Starter #4
the headlight on that side works fine, tho. both are in the same nearly new Depo fixture. I'll check for voltage at the 5(6) pin plug when the fog lamps are switched on, tho.
 

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Premium Member
1993 300CE Cabriolet (mine) ; 1994 E320 Wagon (wife's) ; 1990 Benz 300E 2.6 (son's)
Joined
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6,829 Posts
Discussion Starter #5
Has anyone been doing any other work on the car lately? I wouldn't doubt N7 is fine but the problem is downstream. (If one lamp works, doesn't that shift the probability of N7 failure down to being more unlikely?)
I figure on pulling N7 and running a jumper wire from N7 1-5 (N, foglamp switch out) to 2-8 (right fog lamp). if the light comes on, the problem is in N7, if not, its downstream. if its downstream, then I'll verify there's power at the grey/green foglamp wire at the headlight bucket.
 
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