2005 Freightliner Columbia DD Series 60 - Runs but wont shut off!!!

Hi everyone, My name is David and Im currently having a weird issue with my truck. I tried the search function but came up with no answers. I have a 2005 Freightliner Columbia with a Detroit Diesel Series 60 engine that will start without hesitation but will not turn off when I turn the ignition switch off. Ive tried replacing the ignition switch but the problem persist.

Other possibly related observations - When I turn the key to the on position, the gauge needles no longer do the sweeping motion and the "check engine" and "engine protect" light does not light up. There is also an Exclamation Mark inside of a Triangle symbol that flashes.

Any help is deeply appreciated. I look forward to learning more about my truck and possible even be able to help others in the future.

 

When I switch the key off the gauge cluster also turns off and returns to zero as it should. I do not have a turbo timer installed on my truck at the moment but I plan on one in the future. I dont have a relay for the ecm, only a 10 watt fuse which Ive been pulling periodically to shut down the engine when necessary.

Does anyone have the wiring schematics or diagram for the whole ignition system by any chance?

P.s. Thanks for the help

 

Sorry for the misinformation but the gauge cluster actually remains on even when the key is off. I've check the 4 studs and from what I remember, one is a ground, one is a constant power source and the other are switched ignition and acc. I've also check the 4 fuses in the battery box in which one 30 amp fuse was corroded and replace to no avail. I'm going to try the voltage back up battery and recheck all the battery wires/voltage.

I have a feeling that whatever the problem may be correlates with the gauge cluster inoperability problem also.

 

It wasn't a fuse in the fuse box but a fuse located on top of the four batteries. unfortunately it was not labeled but I did take my multi meter and varified that there is over 12 volts on both sides of the 4 fuses. Im going to check the back up battery located behind the passenger seat like I was advised. Ill definitely keep everyone updated on my what I find. Sorry if ive been kind of confusing.

 

The fuse that I've been pulling to cut the engine is a 10 watt engine ecm fuse. I only checked the battery box fuse because I was all out of ideas.