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| Looks like you found the connector...and the terminators....and now that opens up a mystery,
First off, the terminator at the engine is what's called a passive terminator. Its just a 120 ohm resistor. If you check the resistance at the terminals of the terminator where the 2 wires from the harness plug in, you should get the same resistance your ohmmeter shows at the laptop plug-in.
Now, the terminator behind the ICU is what's called an active terminator. It doesn't have an ohms value, it needs 12 volts supply and ground to make it work. Think of it as a voltage regulator. Now on the CaseIH tractors of that vintage, we replaced those terminators with passive ones as they failed. I would assume the sprayers are similar. CNH offers a complete unit that plugs into the 4-pin connector at that terminator and converts it to a 3-pin terminator similar to what is on your engine harness. CNH part # is 87558214. Costs $28. Then you should have the 60 ohm value in the entire CanBus like I mentioned.
About the only other thing you can try at this point is to operate the machine and check the CanBus voltage. While its running, check you voltage at pin C and pin A(center pin) on the laptop connector and voltage between pin D and pin A. One should be just a little bit above 2.5 volts, the other should be just a little bit below 2.5 volts.
Again, good luck. | |
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