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Message: [QUOTE="me2, post: 330923, member: 3825"] Cummins engine are stand alone with their ECMs. Meaning that no external computer is needed to control the engine. A Dodge Cummins ECM might control something external to itself like a transmission, but everything needed to control the engine itself is in the ECM. ECMs have a variety of inputs and outputs, some from the engine and some from the chassis. For whatever reason, the ECMs on the electronic ISB common rail engines have 2 connectors. In older ECMs, (MY05, for example) the engine and chassis inputs and outputs were spread over both connectors. What happened then was that the wiring harness for the engine and the chassis were intertwined. On a model 05 MY 5.9CR, for example, the engine harness has both connectors wired in and there is a plug on the engine harness for all the chassis stuff. (accelerator pedal, cruise control inputs, brake inputs, etc.) This means that every OEM (truck builder) needs a different harness, specific to their chassis requirements. On the Dodge 05MY engines, for example, the harness for an auto engine is different from a manual transmission and the chassis connections came out of connector C130, which was part of the harness. With the CM2100 and CM2200 ECMs, Cummins got smart. They put all the engine inputs/outputs on one connector and all the chassis inputs/outputs on another connector. Thus each ECM has an engine connector and a chassis connector. This means that the engine harness only connects to the engine connector and that all the engine harnesses (within reason) are the same. There is no auto or manual specific harness anymore. The OEM then makes whatever connections they want directly to the chassis connector, which is sometimes called the OEM connector. The "problem" with this is that there is no longer a C130 in the engine harness to wire into. Anyone swapping a Cummins 6.7 needs to wire in just like Dodge and Freightliner do, via the OEM connector. Here is a CM2100 ECM with the engine wiring harness connected. [ATTACH=full]86230[/ATTACH] Notice that the OEM connector is unused at this point. Here is a CM2200 ECM with the engine wiring harness connected. Notice that its an entirely different connector. [ATTACH=full]86231[/ATTACH] The good news is that Cummins will sell a CM2100 OEM connectors directly to the customer. It only took me 3 tries and 2 months to get one ! Here it is. [ATTACH=full]86232[/ATTACH] Here is the other side of it. [ATTACH=full]86233[/ATTACH] Here are the pins for it and the tool used to extract them. [ATTACH=full]86234[/ATTACH] [ATTACH=full]86235[/ATTACH] [ATTACH=full]86236[/ATTACH] In case these images ever disappear, the connector part number is 4919396, the pin part number is 0462-201-20141. I don't have a part number for the pin tool. My Cummins dealer just gave them to me. There are two different pins that differ only in the size of wire they are meant for. These pins are the bigger ones. These pins are meant to crimp with a crimp tool. My dealer has one. They tell me I might be able to buy one. I didn't try. I'll be soldering my wires to the pins. The connector is about $60. I forget how much the pins were. Here is a CM2100 with the OEM connector installed. [ATTACH=full]86237[/ATTACH] I have not tried to wire mine yet, so I cannot comment on how hard or easy it is. The problem with finding that connector was that Quickserve does not list OEM connectors for an ESN, and most partsman cannot find anything that is not associated with an ESN. Cummins does, however, make harness repair kits and this connector happened to be available as a repair kit. However, when my partsman attempted to get a harness repair connector for my ESN, the wrong one arrived. It looked correct but was 50 pin instead of 60 pin. Theoretically, one should be able to get one of these connectors from any truck manufacturer that uses the engine. Freightliner, Thomas bus, Ford, etc. I did not try any of them. There are also variations of this connector. If you look at the ECM picture above with both connectors installed, they look identical. However, they are not. Each connector is keyed so that you cannot install the engine connector into the OEM port, for example. If a partsman ever asks, the engine connector for a CM2100 is keyed 5 and the OEM connector is keyed 6. If you look closely at the key in either connector, it has a little 5 or 6 by the key. I have not tried to find the OEM connector for a CM2200 ECM. Do not clean ECMs or connectors or wiring harnesses with brake cleaner. It is corrosive to a lot of things and will wreck whatever it touches over time. [/QUOTE]