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Ok, without removing any wires.
Put the meter to DC volts and place the black lead to a clean ground. You can use the engine, or master cylinder or the front battery negative terminal.
With the red lead, touch the top post (big red wire), you should see 24 volts. (key on or off)
Next, touch...
And for now, until you fix it, to start it, simply use a jumper wire from the stud with the blue wire, and jump to ground. That should get the relay to function, with the key on.
No need to remove wires to do this.
Also, have a look at your controller card.
Pull it out an look for anything that looks wrong, like an obvious burned area.
Put it back in if it looks good.
Ok.
So, you have been feeding the relay 24 volts the way you always have done it.
Tonight I wanted you to jump between the stud with the blue wire, to ground(no need to remove any wires to do this).
Anyway, you indeed do have the wrong relay so that needs to be changed.
Then we can see what...
I'm confused what you said you did.
You jumped the blue wire to the top post? Are you saying you jumped it to the large red wire? That is not what you do.
Do you have a digital multi meter, and know how to use it?
Just to confirm, the relay is/needs to be a 12 volt relay. With isolated...
I would try jumping the blue wire to ground with the key on.
If the relay thunks, and your glow plugs are not working(getting 24-12 volts) then the relay is bad(bad contacts).
If it does not thunk, well that's just a sound, but it might lead to the card/system is not functioning.
Should say right on the master cylinder cap, DOT5.
Yes, you need to empty the system, them blow it out, then flush it completely, then fill and bleed it.
If you did not disconnect (the only way you'll see voltage on the black wire) the small wires when checking voltage, you can read a low voltage because the load of the relay.
There should be no voltage on the small purple wire when running, only when the key is turned to crank position.
The small black wire is a ground for the relay coil.
Your ignition switch must have full travel and your ignition switch sends 12v to the small purple wire.
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