Powerstroke, 7.3 Glow Plug Relay Test

On a 7.3L Powerstroke, if you suspect the glow plug relay is bad, chances are it is. This is super common. If you want to be thorough and test it to make sure, this is a good test to perform.

[@dennissteele2052]

Thanks for the video the light covers the screen I can't see the last number but the video makes perfect sense when it doesn't go near to zero that's when my glow plug relay is out

[@sabkaswagat]

Thank you soo much....
I got to check my relay with your video, and now I'm sure my relay is faulty
And I need buy an expensive new one..

[@adolfohdez31]

thanks man....i need a relay for sure!!!...

[@damon123jones]

simple and cool .. thanks

[@tagminda4565]

Hi. What if the voltage going to glow plug is only 9v. Do i need to change my relay?

[@jamrspancurak938]

I'm not getting an pcm ground to my relay think it's pcm or wire or way I can test it?

[@Cfass1]

Very nice and simple. What's the spigot used for on the heater core hose.

[@zzsh0tgunzz]

Makes the AC work efficient due to the stop of hot coolant to the heater core when the AC is running.

[@bigpapafloyd3433]

I hooked my black lead to the battery, and the red to the glow plug side.i had battery voltage, but as soon as I turn the key to wait to start. It dropped to 10 volts, does that mean it's bad?

[@Texelectric]

Yes - It should read barely any volts, in the 0.1 range.

[@sabkaswagat]

And mine only dropped to from 12.25 volts to 12.09 volts ...
That's also time to replace it??