Glow plugs???

[notenuftime]

So I went to start the truck today, it's about 40 degrees out. Never have had issue starting my truck. Recently replaced my GPC and GP are about 5years old everything has been fine. When I started it today my wait start light came on then went out pretty quick then got the amp gauge movement. I could not get my GP
To charge for a normal amount of time and resulted in a rough start. Any thoughts on what might be happening ?

 

[riphip]

Time to check glowplug resistance is where I would start.

 

[notenuftime]

Time to check glowplug resistance is where I would start.

How do i go about that?

 

[DaveBen]

Use a ohm meter and check between ground and the tip of the glow plug. You should see about .8 to 1 ohm if they are good. If not you will see nothing or open.

 

[notenuftime]

Use a ohm meter and check between ground and the tip of the glow plug. You should see about .8 to 1 ohm if they are good. If not you will see nothing or open.

So remove each one and test??

 

[firehonomichl]

I use a test light put on the positive terminal of your battery and touch the top of the glow plug and if it lights up it’s still good. If the test light doesn’t light up it’s no good anymore.

 

[notenuftime]

I use a test light put on the positive terminal of your battery and touch the top of the glow plug and if it lights up it’s still good. If the test light doesn’t light up it’s no good anymore.

Is a test light something i can pick at the auto store?

 

[Chief]

Is a test light something i can pick at the auto store?

Yes.

 

[franklin2]

If you test each glowplug, and they all test good, go in and try it. 9 times out of 10 it will be back to normal. What did you do to fix it? You disturbed the electrical connections to the glowplugs. In about 2 weeks you may have the problem again. Go out and unplug and then plug each glowplug wire back on the glowplugs, and it will be fine again for another 2 weeks or so.

I got tired of this, so I went to a manual pushbutton and it overcomes this problem......for a awhile. It's been about 5 years since I started using the manual button, and now mine is starting to get stubborn again. My glowplug connectors must be really getting bad if I can't burn through the corrosion with the manual button. I am going to have to go to a plan B I believe.

 

[nelstomlinson]

Use a ohm meter and check between ground and the tip of the glow plug. You should see about .8 to 1 ohm if they are good. If not you will see nothing or open.

The test light should work, but this is the way I like to test them.

To do this test, unplug the wire from the top of the glowplug and leave it installed in the engine block. Put one lead of the Ohmmeter on the negative terminal of the battery and put the other lead on the top of the glowplug, where the connector connects. Now you are testing the resistance of the glowplug and the ground circuit.

If you have a clamp on ammeter which can read DC Amps, you can put that on the wires to see the actual current draw while the plugs are cycling. It should probably start around 400A per side? but it will fall off rapidly as the plugs heat up.