2008 BX 2350 Glow Plugs Indicator Stays on After Starting Engine

[Eagle1]

I would assume battery voltage at the buss bar when preheat and nothing (near nothing?) when not heating.

 

[GrandpaSmurf825]

It sounds like without being able to troubleshoot it that the relay probably has the contacts welded shut on it. The relay is going to be energized when you go to start or heat. If the contacts stick it will heat the glow plugs as long as the key switch is in the on position. It appears as though its just a Bosch style automotive relay but it might be higher amperage or something proprietary. You can unplug it and test as the manual states on page 440. If it has welded the contacts it will show continuity 2 and 3. The way they state it in the manual is confusing. That's the important part to check. If that doesn't show they are welded then you probably have a more serious issue. This is definitely where I would start though.

 

[GrandpaSmurf825]

Okay. So my plan to start will be to test the voltage and see if the glow plugs are actually being energized. Can anyone tell me what the voltage should read on a multimeter when the glow plugs are in the preheat mode versus what they should read when the tractor is in operation? I assume I should be testing the voltage on the hot lead that you pointed out, number two

Page 448 says you should be seeing battery voltage at the glow plugs. See my earlier post about checking the glow plug relay. It isn't uncommon for relay contacts to get welded. Also check your battery voltage. It doesn't have to drop much to cause amperage to increase to levels that can cause damage. It is often overlooked because if it starts it has to be good right? Generally that's true unless it takes some extended cranking.

 

[rScotty]

Page 448 says you should be seeing battery voltage at the glow plugs. See my earlier post about checking the glow plug relay. It isn't uncommon for relay contacts to get welded. Also check your battery voltage. It doesn't have to drop much to cause amperage to increase to levels that can cause damage. It is often overlooked because if it starts it has to be good right? Generally that's true unless it takes some extended cranking.

It would be a good pencil and paper exercise to run some sample voltages in Ohm's law and watch what happens to the amperage.
I just don't see how a voltage drop can cause amperage to increase. Can you give any examples or explanation?
Thanks,
rScotty

 

[Hoho223]

BobCat CT120. Mines does that also but intermittently. It is a cold weather event. Don’t remember it happening in the summer.

 

[GrandpaSmurf825]

It would be a good pencil and paper exercise to run some sample voltages in Ohm's law and watch what happens to the amperage.
I just don't see how a voltage drop can cause amperage to increase. Can you give any examples or explanation?
Thanks,
rScotty

It's the same as the same motor wired for 240 draws half the amperage as it does on 120 volts.

Ohm's Law

If voltage decreases and resistance is constant, current increases