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Old 11-04-2017, 10:58 PM
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'89 560SL tail light

Pass side tail light does not glow
Looks like a poor connection somewhere between the fuse box (full 12V @ fuse #13) and the rear wiring harness (3-5V)
There is only 3-5V everywhere I can test it in the trunk area (measured at the gray/red wire along the right quarter, 8-pole connector & bulb socket)
Wiring diag. shows a 12 pole connector upstream of the trunk
Is this connector in the rear of the car, midships or under the dash?
Or is it likely the bulb-out sensor solder joints need to be reflowed, is that under the dash?

As a side note, the pass. side taill connector shows 12V at pole #7 which the wiring diag. claims is not connected as of MY 86. No revisions shown in Startek.
Anything I am missing?
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Old 11-04-2017, 11:04 PM
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Does the R107 even have a bulb failure module in it? If you're only getting partial voltage at all of your pins in the same plug, I'd suspect a bad ground. If you have access to the factory service manual, it will give a connector name for the 12 pole connector you mention. The end of the ETM should have a reference section telling you where the various connectors are in the chassis.
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Old 11-04-2017, 11:36 PM
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I'll check the wiring diag. again but first I looked, it only mentioned the wire going to a 12 pole connector between the tail light and the failure sensor.
Yes, the 107 has a bulb failure sensor, just not sure where it is but think it is under the dash behind the glove box.
Partial voltage is only on Pin 6 all the rest show a full 12V so it isn't the ground.
__________________
1999 E320 (gave to daughter) 250K
1994 F150 (new engine installed!) 240K
1989 560 SL (Refreshing top end) 150K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (awaiting engine diagnosis) 349K
1986 242Ti (fallow)
1968 GT500KR (under restoration)
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  #4  
Old 11-05-2017, 11:07 AM
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If you have a bulb failure module, they're known for getting cracks and breaks in the solder joints on the circuit cards. My '83 hasn't got one, I didn't know if the '86+ models did or not. Not sure where it is, but it's worth pulling and inspecting/resoldering the solder joints where the pins meet the card.
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'11 Honda Accord EX - "The Daily" 64K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "The Diseasel Jr." 168K
'86 300SDL - "The Diseasel" 189K (Totaled 1/31/19)
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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  #5  
Old 11-05-2017, 04:19 PM
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Where are you picking up your test ground? If from the tail light system, a bad ground will affect everything. For situations like this, I tend to add a temp ground / apply power to circuits as a test.
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