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After reading some of the threads I researched on here, I think some of my glow plugs are on there way to bad..lol.. I just started noticing since the weather has been colder in the mornings then usual that it is sometimes hard to start,well takes little bit to start if you know what I mean. Once its started it runs great and if I drive and turn off then restart it soon after it fires right up. I make sure I wait til the light goes off to start anyways so that is my thinking of the glow plugs. If so where can I get them, test them, and remove them? I am new so I will be getting the owner's book out..lol... anyways its a 99' f350 7.3 powerstroke.

Thanks

David
 

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Welcome to the site :Thumbup: you can test your glow plugs if you have a digital multimeter. disconnect the injector harness connector at the middel of the valve cover. on the valve cover side of the connector thier is 9 pins,the 2 on the ends of both sides are your glow plug circuit pins. set your meter on ohms. black lead to ground,now red lead to one of the pins. a resistance measurement of 0.1-2 ohms indicates a good glow plug. anything over 2 is bad. check all 4 on that side,then the other side. I prefer the battery -post for the ground. remember the glow plug on time is dependent on oil temperature and altitude. the glow plug relay comes on between 1-120 seconds and does not come on at all if oil temperature is above 131 f .:Thumbup:
 

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Welcome to the site

diesel71 already told you how to test the plugs the other problem point is frequently the glow plug relay. With the same multi meter measue the voltage on the two large lugs when the glow plugs are on. The voltage drop should be less than 0.5V
 

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BJS said:
Welcome to the site

diesel71 already told you how to test the plugs the other problem point is frequently the glow plug relay. With the same multi meter measue the voltage on the two large lugs when the glow plugs are on. The voltage drop should be less than 0.5V
:agreed:
 
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