HELP! HJ45 Glow Plug Controller heating too fast

[Alex Gromov]

Hello!
I'm Alex from Russia.
I have a few questions:
I put new original of controller heating glow plugs(28550-46031)
It is heated for 40 seconds, and should be heated for 20 seconds.
1) What can be the problem?
2) If one of the glow plug is not working time the heating spiral will be more or less?
Engine 3В voltage 24 volts

 

[lostmarbles]

Hello!
I'm Alex from Russia.
I have a few questions:
I put new original of controller heating glow plugs(28550-46031)
It is heated for 40 seconds, and should be heated for 20 seconds.
1) What can be the problem?
2) If one of the glow plug is not working time the heating spiral will be more or less?
Engine 3В voltage 24 volts

Hi Alex

Are you running the correct 20.5V plugs as per this thread?: Which plugs should I be running - B, 2B, 3B, H and 2H diesels

Assuming you do have the correct spec plugs in use there, if one is not working that would indeed cause your problem (that is, it would indeed increase the time taken for your glow controller to start glowing - assuming it manages to glow properly at all).

Other possible causes of increased glow-time that spring to mind (besides having the wrong higher-voltage plugs or having one or more plugs not working properly) are:

• a poor electrical connection somewhere in your glow plug current-supply circuit, or
• burnt contacts within your glow relay

 

[Alex Gromov]

Thanks for the answer.
I need another circuit diagram Toyota BJ40 before 1978, engine B, 24 V
I know where that is on your forum this circuit, but I can not find it.

 

[bj40green]

Here are the links for downloading the pre '79 wiring diagram
Download, print and glue together.
http://i1112.photobucket.com/albums/k490/ruud_coco/Wiring diagrams/Image-13_zpsyeys2muz.jpg
http://i1112.photobucket.com/albums/k490/ruud_coco/Wiring diagrams/Image-14_zpsaqoy5eoz.jpg
http://i1112.photobucket.com/albums/k490/ruud_coco/Wiring diagrams/Image-15_zpsovrbpvks.jpg
http://i1112.photobucket.com/albums/k490/ruud_coco/Wiring diagrams/Image-16_zpsif65wvvt.jpg

Rudi

 

[Alex Gromov]

Thank you

 

[Alex Gromov]

Maybe someone will be interesting and useful to the following information.
Resistance (R) in the controller of the original spiral heating glow plugs is 0.003 Om.

 

[bj40green]

Maybe someone will be interesting and useful to the following information.
Resistance (R) in the controller of the original spiral heating glow plugs is 0.003 Om.

Are sure that it is 0.003? Did you measure this with an ohm meter?
Do you have the original glow controller 28550-57020 (number is on top of the controller).

I think that the resistance of the glow controller is around 0.08 ohm.

Battery voltage = 24V
Glow plugs are 20.5 V
Voltage drop over the controller is 3.5V
Each glow plug (the originals from the 70's, not the newer ones which draw less amps) draws 10Amp, so 40Amps in total.
The formula: R=U/I (Resistance = Voltage / Current).
Voltage drop / current: 3.5 / 40 = 0.08 ohm.

Rudi

 

[Alex Gromov]

I measured the glow plug heater controller 28550-46031

 

[bj40green]

28550-46031 is a glow controller that was used till end '78 and is the "open" model.
From Jan. '79 28550-57020 is the replacement "closed" model. Both are electrically the same.

Wow. Good meter that you have there that can measure 3 digits behind the dot.

Rudi

 

[Alex Gromov]

The car in my '78, and maybe even the end of '77.
Resistance is measured in the laboratory at the plant.
Can we expect this resistance to controller by Ohm's Law?
Ohm's Law is true if this would be the controller was consistently in the electrical circuit, but it's worth through the shunt. I do not know how to correct it will be in English. (Can bypass or bridge )
It's my opinion.

 

[bj40green]

Okay, so you have the right glow controller.
Do you have the 20.5V glow plugs?
Did you check them for continuity? They should be between 3.4 and 4.4 ohm each.

Rudi

 

[Alex Gromov]

Excuse me for a long time did not answer.
Glow plugs new 20.5 volt are in the garage, which now stand on the machine can not say I do not unscrew, but most likely at 24 volts.
Our winter warmer will try to put the native glow plugs.
Torture me all question:
Why is spiral breakage in the controller to the glow plug is not current?
The scheme is the same here.