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#1
12-12-2004, 11:23 AM
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On my '77 240D, there is a three wire connector
to the alternator. The small gauge wire goes to the charge light. The two large wires both go to the point on the starter solenoid that the positive connection from the battery ties to. Those two wires at the alternator are tied together inside the case(according to the wiring diagram). What is the theory for two wires rather than one heavier gauge wire?
Thanks, 
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Jim '49 170?(donated to church in Darmstadt '58) '58 220S(crusher, after '73 fire[San Antonio]) '72 280SE 4.5 '77 240D '81 300SD '83 240D parts car 
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#2
12-12-2004, 01:13 PM
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Mine had the same thing and I recently replaced them with 2 larger wires. Installed a larger amp alternator and wanted the amprage(?sp) carrying capability. The only reason I could think of is safety and reliability of the electrical system. If one wire is damaged or corroded to the point of high resistance the the other one is there.
OR the output of each terminal is 55/2=27.5 amps in the 55 amp unit and the whole 55 amps is required for running the cars electrical system. This way 1/2 of the output is 27.5 amps and with the 2 wires connected you get the full 55 amps. Who know this may be a lot of bunk, but its the only thing I could think of. Tend to believe the second theory more than the first. Thinking about the design of the alternator, The second idea is probably correct. Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car
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#3
12-12-2004, 01:57 PM
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Leave it to a pilot to theorize and then improve on a troubled design.
I've wondered about myself and I'm sure there's a reason. It may have something to do with the fact that both ends of these two wires are in high heat areas near the exhaust manifold. Maybe MB's folks found that smaller crimp connectors hold up better under such conditions. Of course, if that's so, they may not be correct, because I've had to redo the two connectors on the alternator end a couple of different times. Merry Christmas
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