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I am not sure about max draw, I have a 3126 with a 100 amp alt. The only time it is maxed is when the grid heater is on. It drags down the alt to max output. Voltages go down to 22 when the grid heater cycles. Grid heater has a 100 amp fuse so it should not be more than that. my friend was a...

I have installed remote start systems for automotive gas cars. I would assume the principle remains the same. A remote start module controls the start sequence. Most start systems use alternator voltage to detect a start. Other systems use an output such tach to determine a start. I think most...

i need to correct myself the serial comm is not from the keypad but to the diagnostic connector. You might have to check your termination resistors for your 1587 and your 1939 data bus

it seems like to me you need to find out where the comms are being lost. Allison ecu to key pad or CAT ecu to Allison ecu You can check the serial connection from the keypad to the Allison ECU. Disconnect keypad and Allison ecu ohm out the wires from A to black S1, and B to black s17. good luck

There is a designed system the sort of acts like you are describing. The WABCO ECUs on the A1s can be programmed to use active traction control. After I got my truck I could not get my ABS light to go off, I got a code reader and found that my WABCO ecu was looking for an ATC valve and would...

The 3126 and C7 have an input for service brakes, per the wiring diagram the input to service brakes is hard wired to the sensor common. You can do a wiring check from pin 5 on your ECM p2 connector to 45 to see if you have continuity.

The adapter plate in the bell housing is different. Digital throttle, 1939 data bus wiring. I think the physical install would be the easiest part. Hard part is redoing the wiring. was the 3126 from another FMTV?

Looks like an ABS ECU, they are WABCO ECUs. ABS works well, they usually don’t fault and when they do it is usually the sensor starts to wander from the tone ring, all it takes is a punch and a light tap to reseat them.

It looks like an A1, no hand trottle. Also you are missing your snorkel, check for water in the aircharge before starting.

does your PDP have the printed circuit board? if you do you should have LEDs for 12V battery/Ignition.

Thanks for finding that. I have always wondered why cars are using lighter oil. My guess is most automotive industries are using lighter oils in their cars and trucks to gain higher fuel efficiency. looks like the engine and transmission oils they went down to 0w-20. It makes since since it is...

You can put a clear line between the water seperator to your lift pump to see if air is running through. I used vinyl hose but there is better materials you can use. My truck was loosing prime so it would run poorly till the air was purged out. If I cycled the primer pump before each start I...

I have an A1, with 4 hours of preheat via block heater and high idle with the exhaust brake in warmup it takes about 10 min to defrost the windshield and for the heater to produce decent heat. if you were missing a regulator it would take a very long time to warm up. It could be your temp gauge...

it would take about 30 min to check, drain about 5gallons of coolant, remove grill, seperate heater hoses open heater core valve and blow air through them or flush with a hose.

How is your coolant level? I flushed and filled my coolant via a vacuum fill system. You can also take your heater apart and check the cable to the heater core valve The heat works well in my truck and it can get uncomfortably hot even here in Alaska at 20 deg with no cab insulation.

What are your output speed sensor OHM readings? It sounds like your turbine and engine speed sensors agree, the 25-11 code is only produced if turbine and engine speed sensor are the same speed with output speed at 0 when it should be at the specific speed ratio. The output speed sensor is...

Sounds like your fan solenoid. Good luck https://www.steelsoldiers.com/threads/checking-the-fmtv-fan-system.145266/

It is the one that deleted the heater and the plastic drain bowl. I used a Napa one https://www.napaonline.com/en/p/FIL3417

Sound like you have an air suction problem. The drain hose should not leak fuel unless it is loose or damaged, you can change your water separator filter with a Baldwin BF1222. It is a single piece without the drain assy.

the Wtec 2 troubleshooting manual, look back in the thread I think NDT linked it. Appendix B gives the clutch and system pressures values.