1502D Wiring Components

wspeirs-HT

New User
I have a Yanmar 1502D (gray market) tractor. Everything used to work perfectly, then mice got into the electrical under the steering wheel/dash, and chewed some wires. Now the thermostart doesn't work (no light when I turn the key to the left). I'm trying to understand the wiring so I can test which parts aren't working. What are the various components in the picture? I believe the first one is the voltage regulator, but no clue about the other 3. I do have a manual, but it is all in Japanese, and so I'm left using Google Translate.

How would I go about testing the thermostart? Can I just hook 12v to it, and it should start to glow? Any diagnostic help would be greatly appreciated. Thanks in advance!
 

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Yes, 12v to the heating element should make it work. If not, something wrong with the element. I had a 2002D and #4 on it was the thermostart control which controlled the light going off letting you know to let go of the thermostart position. #1 is the voltage regulator, #2 and #3 I don't know. I don't remember my 2002D having those.
 
I have a Yanmar 1502D (gray market) tractor. Everything used to work perfectly, then mice got into the electrical under the steering wheel/dash, and chewed some wires. Now the thermostart doesn't work (no light when I turn the key to the left). I'm trying to understand the wiring so I can test which parts aren't working. What are the various components in the picture? I believe the first one is the voltage regulator, but no clue about the other 3. I do have a manual, but it is all in Japanese, and so I'm left using Google Translate.

How would I go about testing the thermostart? Can I just hook 12v to it, and it should start to glow? Any diagnostic help would be greatly appreciated. Thanks in advance!
On the YTOG, we have the Yanmar YM1502D manuals for free.
These two are the nearest to your machine.
YANMAR YM1401 PARTS MANUAL NPC-1045.pdf
YANMAR YM1510 PARTS MANUAL NPC-1034.pdf
 

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