folks I need some help, the manual just isn't cutting it for me, to make a short story long, I bought a 332 from an old farmer that had it sitting for a while, I'm to the point where i have the engine running like a top, which leads me to the next problem the wiring. I am trying to find out which of the 5 female wires(from the wire harness) goes to 5 male wires on the voltage regulator. The book shows that it is one piece that comes from the wiring harness that plugs into the voltage regulator. It looks like the old farmer may have had trouble with it prior to me buying it and just ran the wires straight to the voltage regulator using spade terminals. Please help and pictures say a thousand words. I will do my best to post pictures of what i have soon. The whole problem is that Im not charging the battery and want to check the wiring before I install my new $130 regulator.
John deere 332 voltage regulator
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They still sell the connector so you can put the wires into the connector so they never get messed up again. That said-take the VR off and see if there is bubbles on the back expoxy. If so it is worth your time replacing anyways. I don't have a picture but 2 wires are the charging AC wires, one (green) sensing wire and one read wire which runs up to the starter to charge the battery. Can't remember the 5th wire but I think it is brown. FYI-when you test the VR it needs to be bolted to the tractor as that is the ground.
Congrats on your new diesel! I just went through the same wiring issues on a diesel I just purchased. Be sure to check the white disconnect plug that is in between the alternator and the voltage regulator. Mine had melted inside likely due to the poor connections at the voltage regulator. The plastic connector plug was missing and the crimps on the spade connectors left a lot to be desired. I installed a new waterproof connector on the two wires coming off the alternator and purchase a new deere connector and terminals (JD AM108849) for the voltage regulator. Below is a picture of the wiring before the repairs which will show the wiring connections you are interested in. There were some issues with overcharging that are addressed in Service bulletin 91-11-30-8. I will send a copy to your email.
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so as you see in the picture, I have the brown wire going to the Red on VG. I have green going to blue #1 on VG. I have the 2 alternator wires going to slots 3 and 4 and then I have a brown wire coming for the wiring harness to the yellow wire on the VG
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Wow-you already have the more expensive and better temp sensing VR unit. Check the Alt first on AC current to see if you are getting anything there as well. The VR as I said needs to be grounded and if I remember there is a pigtail to put down to the bolt hole to ground it-or it also won't charge. And-make sure all the wires are correct. I would advise still getting the correct connectors in there.
The order of the wires shown in the picture Bob Sylvester posted is correct. I'll note that this is a rear (bottom) view of the regulator mounted inside the frame. My 330 has the regulator mounted outside the frame, so the wire order is reversed (mirror image) of the picture.
What those wires connect to, starting at the left end in the picture.
1. Red. DC output to the electrical system. Goes to one of the three ring terminals on the top starter stud.
2, 3 These are the AC out from the alternator, and are interchangeable on those two terminals.
4. Brown. +12 volts to the indicator lamp on the instrument panel when the system is not charging.
Note that this is a different setup than on the Onan tractors and others that are voltage-sensing.
On the small Yanmars, an internal circuit in the voltage regulator senses "no output." Functionally similar to an idiot light in an automobile.
5. Green. Voltage sense for voltage control. This particular wire, and the voltage level on it, is critical to proper operation of the charging circuit. The basic principles of operation of the Yanmar regulator are the same as for the common 3-terminal pass regulators used on other engines with a stator and a permanent magnet field. On the 3-terminal regulators, the output voltage is sensed at the output connection. On the Yanmar setup, the output voltage is sensed remotely from the regulator. This allows voltage control by monitoring somewhere near the system electrical loads and for the regulator output voltage to run high to compensate for losses in the power wiring. The voltage on the green wire terminal needs to be the voltage at the starter top terminal for proper operation. As Deere built it, the green wire is fed through a fusible link, key switch contacts, the 10A fuse, and wiring in the 10A power circuit. So there is a lot between the desired sense point and the actual sensing circuit. Any voltage drop in the wiring that feeds the sense circuit will cause an overvoltage at the starter top stud.
Note that this particular circuit applies only to the Yanmar engines in the 322, 330, and 332. The 430 alternator and regulator are electromagnetic field type, and voltage control is obtained by controlling the field current.
Hank
What those wires connect to, starting at the left end in the picture.
1. Red. DC output to the electrical system. Goes to one of the three ring terminals on the top starter stud.
2, 3 These are the AC out from the alternator, and are interchangeable on those two terminals.
4. Brown. +12 volts to the indicator lamp on the instrument panel when the system is not charging.
Note that this is a different setup than on the Onan tractors and others that are voltage-sensing.
On the small Yanmars, an internal circuit in the voltage regulator senses "no output." Functionally similar to an idiot light in an automobile.
5. Green. Voltage sense for voltage control. This particular wire, and the voltage level on it, is critical to proper operation of the charging circuit. The basic principles of operation of the Yanmar regulator are the same as for the common 3-terminal pass regulators used on other engines with a stator and a permanent magnet field. On the 3-terminal regulators, the output voltage is sensed at the output connection. On the Yanmar setup, the output voltage is sensed remotely from the regulator. This allows voltage control by monitoring somewhere near the system electrical loads and for the regulator output voltage to run high to compensate for losses in the power wiring. The voltage on the green wire terminal needs to be the voltage at the starter top terminal for proper operation. As Deere built it, the green wire is fed through a fusible link, key switch contacts, the 10A fuse, and wiring in the 10A power circuit. So there is a lot between the desired sense point and the actual sensing circuit. Any voltage drop in the wiring that feeds the sense circuit will cause an overvoltage at the starter top stud.
Note that this particular circuit applies only to the Yanmar engines in the 322, 330, and 332. The 430 alternator and regulator are electromagnetic field type, and voltage control is obtained by controlling the field current.
Hank
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