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Good to know, I was worried about this don’t want CID to come a’callin

The older 5 ton tractors and the 275s and M48 used the same fifth wheel. GMC 221 was different. The 818 in the pic has an upgrade modern fifth wheel.

Agree with Coffey1, something is not making proper connection in the battery box most likely. Don’t attempt any more starts until you are 100% sure you have 12 and 24 volts in the proper places.

Gonna have to be real precise here for us to help you. Are you referring to the ignition switch or the red starter button?

Brainstorming: leave it stock and add duct hoses to direct cool air up front

What happens when you turn on the ignition switch? What year is your truck? Don’t panic.

David Doyle probably knows the most about this, here are my observations. My ‘66 275A2 for sure never had a stack, it had the muffler near the transfer case with a downspout. The 1970’s contract trucks did have the skinny stack from the factory. The ‘63 275A1 which I sold to SETOYOTA had a...

Only difference is the A1 has the LDS427 turbosupercharged engine with no muffler and bottom exhaust while the A2 has the LD465 normally aspirated engine with muffler and bottom exhaust. Of course both models would have received the LDT engine with stack exhaust at rebuild time.

Blowby means engine is shot. Nothing to do with injection. I had a 6.2 that smoked on one side as well and that engine went to scrap.

Use the GMT400 downpipe, it hugs the powertrain and runs inside the frame.

ECS is Equipment Concentration Site. But I really really doubt any deuce tractors were used by Special Forces.

Thanks Carnac, this is incredibly valuable information for anyone restoring a M series vehicle. Even if your truck’s serial is not listed, you can easily extrapolate to get either close or spot on to your truck’s registration number (hood number=USA number=Army registration number). No more...

High quality = Sherwin Williams CARC military paint sprayed from a pressure pot. Half assed = home depot house paint sprayed with a harbor freight airless

Geeze those Dekas are only a year old, surely you could have charged them up and put them on a maintainer to bring them back.

The brake light and turn light are the same filament, so this means the lamp unit and the chassis harness are OK. This problem is often caused by the turn switch handle. The other issue is a short circuit SOMEWHERE in the lighting circuit on the truck. It could be anywhere. See if it only...

NOT having a blackout light kit? It's a cool accessory but usually a hacked up mess after the fire depts. get done with them, is that why you consider NOT having one a bonus? I was really fond of mine until one night I was pulling a heavy equipment trailer with lots of clearance lights. The...

Do you feel lucky? Dun had one alt fire. Heater + wiper + headlights + clearance lights + trailer lights= ???

I don't think that will work. The FMTVs are mostly 12 volt. That little yellow terminal on the regulator is not designed for the entire vehicle load, only for the transmission on a HMMWV.

Yes like zero OR infinite. This is an analog input to the controller, it sends out probably 5 volts and looks for 5 volts to be coming back or not. Since this is no current, even the slightest resistance in the circuit due to corrosion etc will cause your symptom.

Those square connectors are for hydraulic solenoids so my guess is it’s for the knuckle crane.