Question? Glow plug damage after leaving key on?
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    bama21fs's Avatar
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    Question? Glow plug damage after leaving key on?

    Somehow or the other, the key in my JD 1025R was left in the glow plug position over night... killed the battery. Took battery out and trickle charged it for almost two days until fully charged the battery. I put the battery back in the tractor, connected it up and tractor cranked right up.
    My question is did this fiasco hurt the glow plug in any way?


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    Jamie

    John Deere 1025R / 60D AutoConnect Mower / H120 Loader / KBOH / Piranha Tooth Bar

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    glc
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    I would think you just drained the battery. Once the glow plugs cycled, they turned off.
    Greg from western pa



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    kylew's Avatar
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    The glow plugs only run for a few seconds then shut off. At least they're suppose too.
    glc, etcallhome, North585 and 2 others like this.
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    I was under the impression the glow cycle was timed. You have to turn the key off and back on to recycle.
    glc, etcallhome, BigJim55 and 2 others like this.
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    It shouldn't have hurt the glow plugs but....

    The glow plugs are activated via a relay (aka a solenoid). When you turn the key the solenoid activates and that provides power to the glow plugs. But there is a timer on the glow plug side of that solenoid. After about 30 seconds the solenoid drops out and power to the glow plugs stops (that's when you see the light on your dash drop off.) That should protect your glow plugs when something like this happens.

    It is possible that the solenoid could be damaged though. The whole time that key was in the "On" position it was providing power to the solenoid. That's why your battery got drained.

    If your glow plugs are now working properly then you're probably fine. But keep all of this in mind for the future. If they act up in a month (or year!) then I'd focus on that solenoid as your prime suspect. It is much more likely that any damage would be to the solenoid than the glow plugs themselves.
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    Quote Originally Posted by JimR View Post
    It shouldn't have hurt the glow plugs but....

    The glow plugs are activated via a relay (aka a solenoid). When you turn the key the solenoid activates and that provides power to the glow plugs. But there is a timer on the glow plug side of that solenoid. After about 30 seconds the solenoid drops out and power to the glow plugs stops (that's when you see the light on your dash drop off.) That should protect your glow plugs when something like this happens.

    It is possible that the solenoid could be damaged though. The whole time that key was in the "On" position it was providing power to the solenoid. That's why your battery got drained.

    If your glow plugs are now working properly then you're probably fine. But keep all of this in mind for the future. If they act up in a month (or year!) then I'd focus on that solenoid as your prime suspect. It is much more likely that any damage would be to the solenoid than the glow plugs themselves.
    Thank You So Much!!!!


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    Jamie

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    This is just one of many instances here on GTT where the brilliant members can answer just about anything.
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    Quote Originally Posted by JimR View Post
    It shouldn't have hurt the glow plugs but....

    The glow plugs are activated via a relay (aka a solenoid). When you turn the key the solenoid activates and that provides power to the glow plugs. But there is a timer on the glow plug side of that solenoid. After about 30 seconds the solenoid drops out and power to the glow plugs stops (that's when you see the light on your dash drop off.) That should protect your glow plugs when something like this happens.

    It is possible that the solenoid could be damaged though. The whole time that key was in the "On" position it was providing power to the solenoid. That's why your battery got drained.

    If your glow plugs are now working properly then you're probably fine. But keep all of this in mind for the future. If they act up in a month (or year!) then I'd focus on that solenoid as your prime suspect. It is much more likely that any damage would be to the solenoid than the glow plugs themselves.
    JimR ~ I have a followup question related to the above. So when does power to the relay/solenoid cease since the ignition key remains in the same 'on' position during operation?
    etcallhome and Robnik like this.
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    Quote Originally Posted by Marlin View Post
    JimR ~ I have a followup question related to the above. So when does power to the relay/solenoid cease since the ignition key remains in the same 'on' position during operation?
    I'd have to go back through the tech manual again but my understanding of the system is that once you turn the key to the "Start" position to engage the starter the solenoid gets cut back out. As long as the engine is running it won't kick back in again. That also protects the glow plugs so that they aren't running if you don't wait out the timer and just start the engine.
    D160 Mower/Bagger.
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    Fuel pump?

    Doesn't the fuel pump run continuously when the ignition is in the "run" position?
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