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#1
03-30-2010, 08:44 PM
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Routing trailer wiring inside -> outside
Question for those who've installed a trailer wiring harness in their W123's (300TD preferred)...
I've got the 5-wire -> 4 wire converter/adapter, and plan to solder the leads from the converter onto the bulb contacts inside the taillight housings. Converter will stay inside the spare tire well. The 'output' of the converter is terminated with the same type of connector that plugs into the trailer harness connector, and then there is an extension which plugs into the converter/adapter and to the trailer harness connector. That said, what is the preferred path to get the extension harness/connector from inside the car to outside? I don't think the openings that the backup light wiring routes through is large enough to pass the 4-wire flat connector through, so what else is there for options? I'd prefer not to drill another hole in the body obviously, and I don't like the idea of passing it out the hatch opening... Thanks in advance, Dave 
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#2
03-31-2010, 01:27 AM
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I don't have the TD with hatch, but I do have the adapter installed and leave it in
the trunk coiled up when not used. I found that hanging it out the trunk was not a problem and the rubber trunk seal seems to have enough give to make it no problem. If that does not work and pinches the wire then a discreet hole with weather proof grommet would seem the way to go.
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80 300D 340K Owned 30 yrs 83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day 02 Z71 Suburban 117,000 15 Toyota Prius 2600 miles 00 Harley Sportster 24k 09 Yamaha R6 03 Ninja 250
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#3
03-31-2010, 01:30 AM
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I also hang it out the trunk in my 240^.
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1981 300TD 4 speed manual Euro bumpers, zender valance and skirts, H&R springs, billy HD's, leveled sls, real AMG Pentas 16x8 et11, vdo boost/egt gauges intergrated into ash tray, eurolights, led 3rd brake light
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#4
03-31-2010, 02:08 AM
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heck, if it's a TD, just pass it out one of the rust holes in the hatch
  oh, yours is rust free? hmm. look in the spare tire well, or the first aid well. the rear window washer routs through there... perhaps a passage is available in one of these openings.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#5
03-31-2010, 02:19 AM
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Not sure about the 123, but my 126 has these plastic things on the sides that the rear bumper grips on to, they have like rubber flaps in them that I passed the wires though.
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Ich liebe meine Autos! 1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete 1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday... 1981 Mercedes-Benz 300SD | Rear ended, retired in garage. 2009 Yamaha AR230HO | Das Boot Excessive speeding? It ain't excessive till I redline!
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#6
03-31-2010, 03:27 PM
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Left coiled inside, pass over lid seal on both chassis.
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James Marriott 2003 Buick Regal 1983 300D (228k, frau Auto) 1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000) www.engineeringworks.biz 1987 300SDL junker 170k 1982 300SD junker, 265k
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#7
03-31-2010, 04:52 PM
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my W124 wagon I just have everything coiled up inside the spare tire compartment. I pull it out and let the hatch close over it when I need it.
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1987 300TDT 1981 VW MKI Caddy 1.6 diesel, waiting on engine swap 1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel assorted gas powered crap and motorcycles RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5
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