No power to glow plugs on B7100D

[USMC8999]

I bought a old B7100D that has issues. The first issue i am trying to tackle is getting power to the glow plugs. I have power leaving the switch when switched to heat the glow plugs but nothing a the hot wire on the plug. Is there a fuse or something I should look for next or just start tracing wires?

 

[Russell King]

I would suggest that the glow plug indicator is bad. It is just above the key switch on the right side of the dash. Or possibly a fuse is blown?

Here is the diagram of the tractor showing the part (#8).

You can try this test to see if that is it (assuming everything else is working properly):
The heat position runs through the glow plug indicator but then power is applied to the glow plugs when in the start position. So hook a meter positive lead to the glow plug buss bar that connects them all together on the top of glow plugs, turn key to the heat position and you say no voltage. But then turn the key to the crank position (you don’t have to push clutch pedal down but you can if you want the engine to crank). You should see around 11 Volta if the engine is cranking and 12 volts if the engine is not cranking.

 

[Russell King]

If you just want to power the glow plugs to try to start engine that is possible but can burn out the glow plugs if held too long.

Just ask if you want to know how.

 

[North Idaho Wolfman]

There is no fuses on the Glow plug circuit.
FYI: The glow plugs are powered in pre heat via the glow plug indicator and straight when starting.

 

[USMC8999]

Ok.

I would suggest that the glow plug indicator is bad. It is just above the key switch on the right side of the dash. Or possibly a fuse is blown?

Here is the diagram of the tractor showing the part (#8).
View attachment 173421
You can try this test to see if that is it (assuming everything else is working properly):
The heat position runs through the glow plug indicator but then power is applied to the glow plugs when in the start position. So hook a meter positive lead to the glow plug buss bar that connects them all together on the top of glow plugs, turn key to the heat position and you say no voltage. But then turn the key to the crank position (you don’t have to push clutch pedal down but you can if you want the engine to crank). You should see around 11 Volta if the engine is cranking and 12 volts if the engine is not cranking.

I will certainly give this a try. Thank you.

 

[Russell King]

@North Idaho Wolfman

I couldn’t find the wiring diagram in this thread https://www.orangetractortalks.com/forums/threads/electrical-wiring-diagrams.65340/

Is it there and if not would you please put it there? I guess if it is there, would you edit that post to put “B7100” so it is easier to find? I swear I searched for it in that thread but maybe it was another one I was looking for!

 

[North Idaho Wolfman]

@North Idaho Wolfman

I couldn’t find the wiring diagram in this thread https://www.orangetractortalks.com/forums/threads/electrical-wiring-diagrams.65340/

Is it there and if not would you please put it there? I guess if it is there, would you edit that post to put “B7100” so it is easier to find? I swear I searched for it in that thread but maybe it was another one I was looking for!

Yep very first post, hahaha

 

[North Idaho Wolfman]

Yep very first post, hahaha

@Russell King (Reaction to this post)
Hope you're not angry with me.

 

[Russell King]

@Russell King (Reaction to this post)
Hope you're not angry with me.

Not you, but myself!