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insturment panel stopped working

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Buellm2
Join Date: May 2009
Posts: 4 Mn
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2009-05-28          163031


Hi i have an Agracat, I believe it is a 2000 or 1999, one day the gauges just stopped working and all of the switches. I can still get it to turn over with the key and the ammeter still works, but nothing else. I have checked all of the fuses, is their a single power cord that runs all of the gauges that i need to look into. By the way I have no Manuals what so ever.
thanks in advance




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insturment panel stopped working

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Buellm2
Join Date: May 2009
Posts: 4 Mn
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2009-05-28          163032


Agracat 2920 -Y385 - 99/00
forgot that... ....


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kwschumm
Join Date: Feb 2003
Posts: 5764 NW Oregon
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2009-05-28          163033


I don't know that tractor but two things that are generally common to all gauges except the ammeter are voltage and ground.

Thinking out loud, and assuming negative ground system, use a meter to measure resistance from the - side of a gauge to ground. If it measures 0 ohms then voltage may not be getting to the gauges. If it measures infinite or very high resistance then there is probably a ground problem.
....


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insturment panel stopped working

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greg_g
Join Date: Jan 2004
Posts: 1816 Western Kentucky
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2009-05-28          163034


Given your estimate of a 8-9 year old Jinma, is it safe to speculate that you have individual gauges - rather than the cluster panel? If yes, you might want to double check the fuses. Are yours the old wire-wrap fuses, or the disposible ATO type?

You might also want to see if your headlights work. The diagram I have shows the individual gauges are on the same circuits with the headlight switch.

//greg// ....


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Buellm2
Join Date: May 2009
Posts: 4 Mn
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2009-05-28          163035


well i am going to be a little angry if thats the case, simply because when they stopped working i pulled them off. and if i remember correctly their was a bad fuse.
Yes i have the single gauges, not the complete panel. ....


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greg_g
Join Date: Jan 2004
Posts: 1816 Western Kentucky
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2009-05-28          163036


So which kind of fuses does it use? I ask, cuz the AgraCats I've seen used the old wire-wrap type. They can be tricky to re-wrap. But the ATO type are not without quirks either. Some may look good at casual glance, but will show bad when subjected to a continuity test

//greg// ....


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hardwood
Join Date: Dec 2002
Posts: 3583 iowa
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2009-05-28          163041


KW is on the right track, grounding is usualy the culprit when a tractor gets about that age. ....


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greg_g
Join Date: Jan 2004
Posts: 1816 Western Kentucky
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2009-05-28          163042


Quote:
Originally Posted by kwschumm | view 163033
I don't know that tractor but two things that are generally common to all gauges except the ammeter are voltage and ground.Thinking out loud, and assuming negative ground system, use a meter to measure resistance from the - side of a gauge to ground. If it measures 0 ohms then voltage may not be getting to the gauges. If it measures infinite or very high resistance then there is probably a ground problem.
Not true - at least for this tractor. There are varistors (sending units) between the gauges and ground. The OPSU is a diaphram type, the coolant sensor is a thermister, the tach sender is a magnetic pickup. But now that I think on it, I guess you may be right in the case of the hour meter. Don't think the AgraCat is externally triggered.

This should also illustrate that none of these gauges share a common path to ground. So if all the gauges went out at the same time, the problem is on the + side. Hence my opening question about the fuse type.

//greg//

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