Hey I have a 1994 dodge ram 2500 4x4 v10 auto chassis with highline and power seat etc and wondering what theese 4 harnesses do? They have tons of wires coming out of them and wondering if they are factory add on harnesses?

 

Connectors for options you don't have, or, junction blocks in a couple instances.

 

Blue one I'm unsure about, the other ones are junction blocks. Used to make a connection in the plugs, a weird thing Chrysler did

 

I'd really like to know what the blue one does a sit looks like a proper plug I can understand the junction blocks now, but the blue plug has been hanging there as long as I've had it

 

Trailer brake controller?

 

The blue plug is the ABS/Airbag diag connector. The other ones look like the infamous Chrysler "joint connectors", aka glorified splices.

 

THANK YOUU! My ABS light is on and I have an idea what it is but would like to make sure I'm gonna look for the pin out to see if I can jump read it or does that require a special machine like I've heard 🤔

 

I think you need a scanner. Can't do the pin truck with OBD1 I THINK

 

I remember a video about it but I'm not sure how said something about a black wire?

 

Grab the FSM from here. Page 5-28 talks about "grounding the diagnostic connector" to get the ABS light to flash but I think they talk about the service connector near the ABS module which is different from the data link connector. Why make it easy ..... Anywho the connector has only a single black wire so you're remembering it right.