My son repaired the wire loom on his 93 300sd (3.5l om603) and the pictures he took of where each connector went on the engine were erased. Unfortunately they are not unique connectors (the IP idle control plug fits other places etc).

Does anyone have a wire harness diagram?

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-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.

May be easier to find a pin out of the ECU then find the connector by testing continuity between the connectors and the ECU.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

777,
I have a couple of manuals I am not going to use any more. A '92 Model 140 manual and a 602/603 service manual. I'd be glad to send them to you for postage. There are a few wiring diagrams in there. Also vacuum diagrams as well. Nice to encourage the younger generation to keep the tinkering hobby going. If you don't need them pass them along to someone else. Send a PM with your address.

Chuck

Everything you need is on the zsmaster site. Search for it.

There are electrical troubleshooting capabilities you can load from there. I ran my Eds troubleshooting from that.

The w140 is a complex beast, but the diesels aren’t that bad when you get an e-FSM from eBay for like $10 and/or use zsmaster site.



The IP idle control plug is red IIRC. It’s a different length than the others that may be like it (temperature sensor?).

Here are some screenshots from harness and Eds testing:

https://www.peachparts.com/shopforum/diesel-discussion/415181-om603-971-eds-codes-diagnosis.html

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)