2004 Chevrolet Silverado 2500 HD Questions

All 2004 Chevrolet Silverado 2500 HD Questions

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just replaced the stock muffler with a flow master, no idea if its related,but thats the only change/maintenance made in many months
when giving full acts like bad gas or filter but has no filter n changed gas
we used this truck to jump another truck after jumping the next truck in line the 2004 chevy would not crank and the security lite was on
I just bought this truck last week. They said they didnt know if the tow haul was working,but thought the light was just blown. I haul horses in the mountains, so I need to know. I'm scared to mess with it a lot since...
Brake lights not working.All other lights are working.Brake light on cab works but not in rear.so far checked bulbs and fuses.can brake switch be bad even though light on top of cab is working.
If break switch is working break lite on cab in back can switch be bad for working tail break lights
I have the 8.1L in my chevy and i was wondering if it is even possible for me to remove the gas motor in my truck and replace it with a diesel motor without replacing my Allison transmission too.
Only happen now and then. Everything comes on when you turn the key but when you click the key over to start the engine nothing happens. There doesn't seem to be any certain time or day or reason for the problem.
I just replaced the thermostats and it still does it at 2000 or more RPM. 2000 RPMs and lover it will run normal, 185deg.
And still no lights!!! Any suggestions would greatly b appreciated