2005 F250 Location of plug for plugging in Diesel truck?

If it has a block heater on it the cord should be in the front bumper of your truck.

If there is not a cord and plug tie wrapped behind the bumper / grill area your truck may not have been equipped with it from the factory - however if you put it up on a rack you will most likely find that the heater is actually installed in the block already - Ford would simply omit the cord and charge you $80 for it if you decided to buy the option ... well the same cord can be purchased at the local auto parts store for about $15! So for a fraction of the cost you too can have this very necessary cold weather accessory hooked up on your truck!

It's by the radiator just below the top framing where the hood touches when closed. If you have the air intake for the engine to the driver's side of the radiator, look between it and the radiator (sometimes it even gets stuffed into the air intake scoop) It will have a plastic cover over the plug's prongs to protect them and so looks like it's just some plugged engine cable.

That plug will be a life saver when it gets cold. The glow plugs can get you started only if ALL 8 of them are working perfectly. The block heater not only shortens the glow plug warming time, but will allow starting with a bad plug or relay. (Common problem with all of the smaller diesels used in pick ups.)

2005 F250

It's coiled up between grille and radiator support.