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www.cargurus.com > Questions > Ford > F-250 Super Duty
CarGurusDec 1, 2014 - 10 mph a very loud snap bang from under the cab (I think) now... ...Could probably hear it from 50 to 75 ... truck - no cut wires - i have no power to my 4 wheel drive button on the inside of my truck ? any ... Used Cars For Sale.
If it blew the "house main" and the circuit breaker did not blow, it indicates the breaker for the unit and the associated circuit wiring has major problems and you need to get them checked asap by a licensed electrician. Don't use it again until the circuits are chceked.
It is hard to determine a repair cost with a description like this but sound like a capacitor blew and that should be obvious when it is looked at. Probably took some fuses and a bridge rectifier with it or it might even be a motor run capacitor- you need to tell us which caps blew up.
Black smoke from a diesel is caused by overfueling, even with a banks the engine obviously is burning the fuel efficiently. Black smoke will not make your truck produce more power, i am not sure why you would want this to happen anyway.
If the internal fuse has blown, if you connect the power lead loosely and move it about, you should not be able to hear any crackling sound of electricity. If you do then it is more likely something else other that the internal fuse. Generally, a loud bang is either the fuse or lamp.
no really, I am just a smart a$$ --- but the loud pop sounds like it may have been one of the capacitors in the power supply board. check for a POPPED cap (rare) and if there is one, test the components in the related circuit - as SOMETHING had to happen to make a cap fail like that - maybe a voltage regulator? give it a look..