[heavydute1]

What is another fix for the stock diode panel.Charging system putting out 25+ AC volts.Can I use 110 rectifier or inline diodes? Anybody done it?

 

[woodpecker41]

I have been around JD garden tractors since 1975 and I have never seen another way to fix this problem. Having said that what you suggest may work and I have used K series Kohler rectifiers on cast iron Tecumseh engines for years with no problems. Let us know if it works or not. Roger

 

[heavydute1]

Thanks Roger.....Do you have wiring diagram 68 SF and up so I can compare the kohler diagram? Thanks. Ross

 

[woodpecker41]

The Kohler wiring is completely different than a VH70s. The Kohler has two AC leads coming off the stator (as do the cast iron series Tecumsehs) that are designed to produce 28+ volts and either 10 or 15 amps at wide open throttle and go to the outside two spade lugs on the voltage regulator (there are 3 spade lugs). The middle spade lug on the regulator has the DC voltage produced that goes to the battery through the ignition switch. The VH70 system is much smaller amp output so I do not think it would work with a Kohler 10 or 15 amp regulator. I think that is why it hasn't been done before. For wiring diagrams of JD engines try placing a wanted ad in the Wanted Section. Roger

 

[bltee]

Half wave rectifier such as these http://www.radioshack.com/product/index.jsp?productId=2062591 will cut voltage in half . Wiring it up might take a little imagination. One side and and one diode will give you 1-1/2 amp charge rate. Two in parallel will give 3 amp charge rate both at 12.5 plus DC WOT

 

[wyogreen]

Building a full wave bridge rectifier is really not all that hard. 4 diodes of the proper amperage rating will take care of that. The real problem is regulating the output voltage to keep from overcharging the battery. If you think about it, almost any regulator of the proper amperage rating should work. You're just taking AC voltage, rectifying it to DC thru a full wave bridge rectifier, and regulating the resulting DC voltage to something like 13.5 volts. I have no idea what the JD 70 puts out for voltage or amperage. If it puts out the same AC voltage and amperage as say the JD 110, then a 110 voltage regulator should work, as long as it is wired up the same.
Steve

 

[bltee]

It is a 12V 3A rectifier panel arrangement as explained on page 51 of the attached manual.

http://toprake.com/index.php?module=documents&JAS_DocumentManager_op=downloadFile&JAS_File_id=2

 

[wyogreen]

After reading the manual Bob posted, it should be an easy matter to obtain a couple of diodes and replace the ones on the diode panel. Since there is no voltage regulation on this circuit, you only need a couple of diodes rated to handle at least 35 volts at 3 amps.
Good luck, Steve