Is there a wiring diagram on here for, like, the WHOLE wiring harness?

 

Not that I have seen.
If you buy a Haynes or other service manual, some of them have detailed diagrams.
Your public library is also a good source for diagrams.

 

The one in the Chrysler service manual is just plain lousy. It gives branch circuits so if you want to attempt to trace a complete circuit you have to keep flipping back and forth through various pages which adds to the confusion.

 

Let me know if you find a better one than the Chrysler diagram.

 

Definatley......

 

Anyone else got any leads on this?

How about a source for a new/used wiring harness complete? My 90 D250 is in dyer need of a new one or if I had a good diagram I could possibly build one from scratch.

Eric

 

this is a great question - I always assumed I'd have no problem checking and repairing the rat's nest of a wiring harness I just pulled out of my 1990 W250 diesel .... Looks like it won't be as easy as initially thought.

 

engine bay or behind dash or both?

 

Looking at Chrysler's rat-nest idea of wiring, I believe I could do way better just wiring everything point-to-point.

Remember, O.E.M.'s idea is cheap and quick first, and quality only by accident.


Look behind the driver-seat, behind the dash, and under the hood of any decent older big truck, such as the Macks, I-Hs, and etc., and you will see much better thought out wiring systems.

 

Michell manuals has the best I have seen. Go to Mitchell1support.com Tell them you were considering subscribing to their service, and you should be able to get a 2 week online trial to the service.

 

whats wrong with the wiring that you need a whole harness.

 

None of the factory gauges work, the wipers don't work, headlights don't work, horn doesn't work.......get the idea? Also if you saw the condition of the current harness/wiring then you could understand why it would need replacing.

I found a factory Dash wiring harness from a 93 off another member on this board, so I all I need now is the harness for the engine bay. I can re do the rear chassis harness on my own, not much to it.