Glow Plugs I am trying to find the plug were I can plug in a cord to help warm up my glow plugs in a 2005 ford F250. My fiance has the truck and the owners manual so I can not look it up in the book.

The glow plug light comes on to show that the glow plugs are warming up. You should not start the vehicle until the light turns off, as it can damage your glow plugs. The light should turn off after a few seconds while the ignition switch is in the on position. In short the vehicle is working properly.

Are you waiting after turning ignition key on before actually moving key to start position? My diesel I turn key to 1st position;bells and lights;if engine is cold an amber light that looks like a lamp filiment comes on...wait until that light goes out before engaging the starter.

This engine 'loves' glow plugs! One goes and the others try to handle the amps. Change them and you will have no probs! Other than that, I feel this is about the best diesel truck made!

GLOW PLUGS ARE LOCATED UNDER THE VALVE COVERS.

there is a block heater you plug in is usly in front grill of the truck looks like eltric cord end the glow plugs heat up when you turn your key on

The wait to start light always comes on for at least 1 sec, if it goes off early it must think the engine is warm.

My guess is you have a faulty engine oil temp sensor that is telling the pcm that it is already warm. The only way to know for sure is to read the info with a scan tool.

Glow Plug System: Description and Operation
GLOW PLUG SYSTEM
The 6.0L diesel engine uses a glow plug system that preheats air in the combustion chamber to improve cold engine starting.
The system consists of:
- glow plugs.
- glow plug control module.
- powertrain control module (PCM).
- engine oil temperature (EOT) sensor.
- barometric pressure sensor (BARO sensor).
The glow plug monitor system is part of the On-Board Diagnostics II (OBD II) System.
The glow plug system is electronically controlled by the powertrain control module. If the oil temperature is below 55°C (131°F) the powertrain
control module will energize the glow plugs immediately after the key is placed in the ON position. Then, depending on the readings from the engine
oil temperature (EOT) sensor and the barometric pressure (BARO) sensor, the powertrain control module determines how long the glow plugs will be
on.
The glow plugs are located in the cylinder heads, under the glow plug buss bar.
The glow plugs are self-regulating. If the engine oil temperature is above 55°C (131°F), the powertrain control module will bulb-check the WAIT TO
START lamp but not energize the glow plug relay.
The glow plug ON time varies from 0-120 seconds depending on battery voltage, engine oil temperature and barometric pressure.
The glow plug control monitor (GPCM) system is designed to find failed glow plugs or failed wiring in the glow plug system.

Check the fuse first then check the wire harness and connection working your way back from the glow plug to the fuse box. Good luck and hope this helps. If everything is good then replace the glow plugs. 

Your Glow plugs are getting weak,try plugging it in to the outlet it should have a cord by the front of the grille. the glow plugs are just to start it.

You need to check the glow plug system. Check for power from the glow plug relay.

you've got a short somewhere, or one of the glow plugs is bad.