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 06-02-2013, 21:56 Post: 187168
jaker65



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 Cub Cadet 7200 Glow Plugs Burn Out

well i am not sure if anyone has had this problem before but here it goes.

i have a 7200 cub cadet with a 3 cylinder mitsubishi engine, and every time i go to put new glow plugs in the engine, as soon as i turn the key, they burn up. no longer good. i have replaced the timer and relay for them.

i even tried putting in my own switch with a wire coming from the battery to a in line fuse, then to a switch, then a wire from the switch to the glow plugs and i would get the fuse shorting out and blowing or if i just take a direct line to the switch and take out the inline fuse, they short out my glow plugs.

i need some serious help here, could it be possible that the glow plugs could be touching somewhere in the head and shorting out? i am out of mind here, i have had this problem for 5 years now.






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 06-03-2013, 17:35 Post: 187191
minimac



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 Cub Cadet 7200 Glow Plugs Burn Out

I don't have that machine, it seems that your glow plugs are staying on too long and burning out. My tractor has manual glow plugs integrated with the starter switch that I hold on glow for 8 secs manually. You might have an auto control that has failed letting the plugs stay on too long and burning them out.






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 06-03-2013, 18:11 Post: 187193
Murf

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 Cub Cadet 7200 Glow Plugs Burn Out

Jaker,

First off welcome to the forum.

As for your problem with the glow plugs the best way to diagnose any sort of a short-circuit like that is not by burning up the glow plugs set after set but instead use a car headlight bulb the old-style sealed beam units.

It doesn't matter how much power you apply to a headlight bulb the resistance coil will only take a certain load and you cannot overpower a headlight bulb.

However in theory a glow plug it is really only a headlight with no glass around it so I don't understand how you can be burning up glow plugs.

Is it possible that your battery or alternator are defective and your tractor does not have 12 V in the system?


Best of luck.






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 06-03-2013, 20:56 Post: 187200
jaker65



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 Cub Cadet 7200 Glow Plugs Burn Out

well i dont think the timer is the issue, i replaced both timer and module for he glow plugs and there was no difference. the glow plugs only stay on for a short 3 seconds and then turn off.

as for the voltage, the battery is staying at 12 volts and when running the alternator is at 14.4 volts. i even left the meter on there for a while thinking somewhere it might change and i did not see a difference or change in voltage.

the headlight idea sounds good. how would i go about hooking one up. i have a old round head light with only two leads on it. am i correct to assume you would hook up a hot wire from the glow plug wire and then ground the other end out where the plugs would be grounded?

thank you all again for the advice. its more helpful than the bull international dealer.






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 06-03-2013, 23:01 Post: 187203
kthompson



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 Cub Cadet 7200 Glow Plugs Burn Out

It really sounds like you have higher voltage there than the glow plugs are designed for. "Verify" the voltage they are designed for and the voltage to them. You may want to take a new glow plug and hook it up to 12 volts with test meter on it to see if it will last if powered a few seconds.






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 06-04-2013, 14:11 Post: 187216
jaker65



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 Cub Cadet 7200 Glow Plugs Burn Out

i am sure the plugs are 12 volt. on the sides they say 12v on them. i will double check for you though. as for goin to a 12 volt source. that wasnt a problem. i took the top and connected it to a wire goin to the positive side of the battery and grounded the side of the plug with the threads that go into the engine head on the negative side of the battery and no problem. they lit up and i even held it there for 5 seconds. no problem at all. to make sure i even did it a couple times with the same plug with 5 second intervals.

i just wish i knew electrical systems better. im going to try the light bulb trick here in about an hour and will let everyone know how that goes. gotta get some brain food in me first. thanks again.






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 06-04-2013, 16:13 Post: 187219
jaker65



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 Cub Cadet 7200 Glow Plugs Burn Out

okay i have an update for you guys.

i did the light bulb trick today. i took the hot wire to one side of the bulb and grounded it to the threads on the glow plugs where it screws into the head. the light come on, and went out properly. i grounded it on all 3 plugs at the same spot. the bulb did not burn out at all.

i also got the numbers off the plugs. they are as follows

Brand name is NGK
08Z2
Y724U
8V

i think i should apologize and now that i see it, from my best guess that it looks like the plugs could be 8 volt glow plugs. i could be wrong but its my best guess.

the meter did say 12 volts though coming from the hot wire that goes to the plugs. hope this information helps. thanks again.






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 06-04-2013, 21:00 Post: 187222
DennisCTB

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 Cub Cadet 7200 Glow Plugs Burn Out

One of several NGK glow plug decipher sheets. I think they only make 12 and 24 volt glow plugs from the sheets I have seen.





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Cub Cadet: Cub-Cadet-7200-Glow-Plugs-Burn-Out

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 06-05-2013, 09:08 Post: 187234
kthompson



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 Cub Cadet 7200 Glow Plugs Burn Out

If I am reading all the numbers correctly then his glow plugs are for 12 volt.

Just wondering, how did you determine the glow plugs were burnt out? If I followed it correctly you have correct voltage glow plugs, so the voltage is not burning them out it would seem the only other option is the system is not cutting off or is coming on at other times without you selecting it.

edited due to my misreading the code and then catching the mistake after posting. kt






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 06-05-2013, 20:25 Post: 187257
jaker65



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 Cub Cadet 7200 Glow Plugs Burn Out

i came to determine that the plugs were burnt out as soon as the next time i started the tractor when it cooled down. at that point i pulled out the plugs and checked them on a 12 volt source and they didnt work.

its as soon as i screw them in, turn the key, they come on, and they burn out. im really lost at this point.






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Discussion Boards > Active Subjects > Messages as Posted > Cub Cadet Forum

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