Ok thanks! I'll try that today and let you know

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So I tried it and leaving the key on for 30 seconds made it smoke more then turning the key on and off 5 times. Truck starts within 2 seconds even in -4 celcius I don't know if that will help you try and diagnos the problem:s:

Here is the way the glow plug system works... First thing is to just forget about the WTS light. It means nothing. When you turn the key to the "ON" position. The relay kicks on and sends power to the glow plugs. Now this happens for up to 90 seconds depending on engine oil temp, outside temp...etc... Cycling the key as you do only does this,,, turns the glow plugs on, turns them off, turns them on, turns them off... Catch my drift?

You can visually watch this by watching your ammeter suck down when you turn the key on. Then it will pop up later randomly. Thats when your glow plugs shut off.

Here is a video a guy from another forum posted. Shows you exactly what's going on with the gp system. I have the same led in my truck...

Defiantely get gauges before you get a chip/ programmer.......most importantly pyrometer. Ya dont wanna cook the turbo for not knowing where your EGT's are, and running it too hot.:rocking:

Ohh that makes sense, where on the relay would I put the led power wire to? If the glow plugs turn off fast after I put that light in does that mean I have a bad relay or glow plugs?

It would be a bad relay then... The LED isn't showing you anything but the functioning of the relay. The light could come on and the relay could be good but you could have bad glow plugs... IMO for the cost of glow plugs. I swap them on every 7.3 I purchase... It's one of the first things along with fluid changes... It's just too easy not to do and gives me peace of mind...


You can easily test the relay with a multimeter... Basically there will be constant power to one of the large lugs and no power on the other large lug with the key off. Then with the key on, the relay should have the same power on both large lugs. The one that was initially no power and then has power is the side that goes to the glow plugs. That's the side you attach your wire from the LED...

Awesome thank you a lot for your knowledge! If I have any other questions down the road would you mind if I message you? I'm only 17 so I'm sure ill need some other questions answered

Yep, also, make sure you check through the 7.3 section if you have a question... plenty of good info here...