Glow plug resistance

[Oldiron]

Just to quickly verify. With Glow plugs installed and harness removed, one test lead to battery neg and the other on glow plug, I am getting 1 ohm on all 4 drivers side and .8- .9 on pass side.

If I remeber correctly these would be good? Normaly I would test when they are removed, but I installed them less then a year ago.

Truck starts, but I have to hold the button for much longer then I expected. And it doesnt fire until about the 2nd time I try..

I'm going to verify that all conectors have power going to them. What voltage should I expect to see?

 

[Philip1]

I believe anything under 2 ohms is good, for voltage, it should be battery voltage or extremely close

 

[rhkcommander]

Hard to say I usually just hit them with a test light. What brand of plugs?

On pushbutton I could start my prior engine in 5-7 seconds depending on weather with Bosch plugs. With beru plugs it was damn near double. New engine I still give it about 8-10 depending on conditions, time sitting etc

 

[Oldiron]

I'm running motorcraft. And that's what I'm getting, about 15 sec. I'm worried about burning them out if I hold longer. Is there a self regulating glow plug that wont burn out?

 

[FordGuy100]

15 seconds is about twice as long as what is recommended for those glow plugs unless temps are extremely low...

 

[rhkcommander]

Self regulating? Not as far as I know. You pretty much have two choices to sum it up:

Ones that get too hot and ones that don't get hot enough.

15 is too much for beru true, you either have air intrusion or all 8 plugs aren't glowing... or terrible compression. when it starts does it stumble?