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Yep. And this is what happens when they go bad:

The resistor spec is something I know from dealing with CANBUS in general - my CAT ECM bench flash cable had to have a termination resistor added..... the 120 Ohm rating is sometimes shown in the schematic and sometimes not but I didn't look at a manual for that information. I'm sure buried in...

Engine ECM doesn't know about CTIS. Bluefire would have to be programmed to understand the CTIS data and I'm not sure the CTIS is sending data all the time. The pressure reading is only relevant when the CTIS controller does a pressure check so 99% of the time it's going to read atmospheric...

Upon review of the schematic I can verify that the fuel separator bowl heater is on CB49 and is simply ignition switched so it's on all the time with the ignition. Nothing to do with cold start function.

There is a heated fuel bowl on the fuel/water separator element...... someone, somewhere is probably confused thinking that is involved in the cold start. I can tell you without a doubt it is not used by the CAT ECM (at least not directly). I just replaced my entire engine harness from the ECM...

I would do an autopsy on the original. Just for giggles. But really a Deutsch DT 3-pin, terminals, wire, and heat shrink is all you need here. No real need to pot it unless you enjoy such exercises. Or you can buy the actual thing if you like: https://www.customconnectorkits.com/dt04-3p-p006/...

You can just use any 1/4 watt 120 Ohm resistor. Jam it into the P250 female terminals and see if she talks. Meg-Ohm readings or even K-Ohm readings are saying bad resistor to me - 11,500 Ohms is nowhere even close to 120 Ohms..... different universe and not going to work. You can switch the...

No the A1R and A1P2 still use Ether assist and the solenoid/cylinder is in the same location. I just installed a bottle on the existing solenoid. The difference is that the later C7 uses a single Ether nozzle at the intake manifold and the solenoid is a different part number.

Can confirm that cold mode status flag is always set on any start below 158F. The engine rolls coal a bit in this mode. I've never had my Ether engage that I'm aware of but I can't recall at the moment if I had the cylinder installed last winter or not. My truck came from Texas with no...

P250 is supposed to be the harness connector for the R13 termination resistor. Does the matching connector show 120 ohms between C and D? It looked like it would be under the gauge cluster in the TM. But the TM doesn't have the best drawings. But it looks like you found it.

The ABS module is on the J1587/J1708 bus along with all the other modules and connects through the same diagnostic connector.

I could come up with anything and everything but your uncle either won't be able to find it or the price will be so outrageous the exercise will be pointless. Since he specifically said he could find shocks - have him try to find the one's for the front of the A1R/A1P2: 2510-01-528-1547 BAE...

Grove 1-193-0-00516 I'm sure you could contact them and ask - last price I can find is $22,363.00 Seems like you could just buy an M1084 instead.

On the diagnostic connector on the truck check the resistance between pins C and D. This should show 120 Ohms - the value of the J1939 bus termination resistor. If it doesn't, pull the dash panel (gauge panel) and find connector P250/J250 and make sure it's securely plugged together. If it is...

Ah - yeah that would do it. I'll have to check but I thought they both lit up on my C7 truck without the laptop connected. :unsure: Different ECM and TCM though.

Do you have access to an oscilloscope? The 3126b CAT computer should be putting out J1939. Check that your diagnostic port has proper power and ground and then look at the scope trace of the data pins. One thing I have found - especially with the 3126b trucks - the data connection is not as...

I've lost 44 lbs since buying my truck. While this is a legit comment I'm actually ok with the workout. :p

LOL. Possible with the right facilities. Probably not as heavy as you think but still quite a job. Best done with an overhead crane. I wouldn't - not for some insulation. :cookoo:

An air horn inside the cab might actually injure them and get you sued for having a booby trap which is illegal in the US in your house or on your property..... would be funny as hell if you caught it on camera though! Best make sure that you hit the right button on the fob. o_O

I've used both the old style and new. The new thinner version is perfectly adequate. All it does is grip the splines to keep the nut from sliding downhill on the very slightly angled helical plane that is the threads. It's like a wheel chock on a driveway angled at 1 degree - you could do the...