Glow Plug Tests with Manual GP Button

[HesseniusM1009]

Saw smoke and an orange glow near the glow plug closest to the cabin on the passenger side.
At first it was thinking a fire but I’m wondering if a glow plug burnt out. I checked the troubleshooting guide (the old looking one) but it doesn’t mention a button you have to hold to warm the glow plugs. Does that mean this manual glow plug button (circled in the photo) I have was a mod?

What should I check or test prior to putting the new AC 60g glow plugs in if it has a manual glow plug button? I don’t want to swap all 8 and just have them burn out immediately if something else is wrong.

I know there should be the resistor and it looks like it goes to the solenoid but don’t they have to be under load to drop voltage? I can run a multimeter but don’t know what to check before swapping plugs. Thanks!

 

[vanaisa]

Yes, this is modification.
Just remove plugs and test them separately. 12V.

 

[Floridianson]

Myself when checking glow plugs it's easier to leave them in. I disconnect the wire take a test light and hook the alligator clip to positive on the battery or any positive source and then with a point touch the end of the tip of the go plug and the light lights up the glow plugs good.

 

[HesseniusM1009]

Yes, this is modification.
Just remove plugs and test them separately. 12V.

Thanks!

 

[HesseniusM1009]

Myself when checking glow plugs it's easier to leave them in. I disconnect the wire take a test light and hook the alligator clip to positive on the battery or any positive source and then with a point touch the end of the tip of the go plug and the light lights up the glow plugs good.

Okay, cool. I’ll do that then. Thanks!

 

[vanaisa]

Myself when checking glow plugs it's easier to leave them in. I disconnect the wire take a test light and hook the alligator clip to positive on the battery or any positive source and then with a point touch the end of the tip of the go plug and the light lights up the glow plugs good.

I like to visually inspect. GP can be working and all but already slightly swollen.