checking glow plugs

[2deuce]

Are all 24V glow plugs the same for the CUCV? Can brands be mixed? The reason I ask is upon checking each plug for continuity I come up with different values for different brand plugs. If the plug is burned out my meter reads nothing, showing no electricity passing thru the plug. Some show 3.0 resistance and some show a value of zero. I'm guessing the ones that read 0 are still good along with the ones that read 3.0 and the burned out plugs give no reading at all, is this correct? Can you tell I'm confused. I don't want to throw away any working plugs,

Thanks

 

[mangus580]

Its not recommended to mix & match glow plugs. If you have bum plugs, you are best replacing them all.

 

[2deuce]

I read somewhere here that when one plug fails it puts more stress on the rest to where they all fail like dominoes fall. I was thinking that keeping them all working was the way to go. I have bought a new set but didn't want to waste a good plug.
Thanks

 

[BobM]

I read somewhere here that when one plug fails it puts more stress on the rest to where they all fail like dominoes fall. I was thinking that keeping them all working was the way to go. I have bought a new set but didn't want to waste a good plug.
Thanks

IMHO You won't be wasting the new plugs. The way it will start with all new plugs will warm your heart!

 

[CCATLETT1984]

Are all 24V glow plugs the same for the CUCV? Can brands be mixed? The reason I ask is upon checking each plug for continuity I come up with different values for different brand plugs. If the plug is burned out my meter reads nothing, showing no electricity passing thru the plug. Some show 3.0 resistance and some show a value of zero. I'm guessing the ones that read 0 are still good along with the ones that read 3.0 and the burned out plugs give no reading at all, is this correct? Can you tell I'm confused. I don't want to throw away any working plugs,

Thanks

The CUCV does not use 24volt glow plugs. Voltage is run through the large resistor on the firewall (done so the truck can be started from a 24volt truck using the slave recepticle) so the plugs only get ~16volts max when the system is working properly. As plugs fail the voltage will raise because the resistance is dropping (a glow plug is a resistor). The effect snowballs as more and more plugs fail causing even higher voltage to the plugs that are still working, until all the plugs are bad and you have no hope of starting the truck.


Always replace ALL eight glow plugs as a set, they are resistors and you do not want an imbalance between cylinders.

 

[EO2NMCB]

Glow plugs should ohm between 1-3 ohm's above or below that and they are bad.