1987 Wheel horse has a voltage regulator?

[supoc7 0]

I have a 1987 wheel horse M10 461521 that has a voltage regulator. Now, all the schematics I've seen show no VR.

This is supposed to be an unregulated charging system. Now it's charging about 18 volts on a new fully charged battery.

The VR has 3 terminals H,B,S and the number on it is 1046. I would like to replace the VR but not sure with what. The

lights only work with the engine running. I don't want to ruin this battery with this high charging rate. Anybody have any ideas

on whats going on?

[pfrederi 17,147]

That spec engine came with a regulator mounted on the front of the blower shroud.  All the ones I have ever seen terminal are marked AC  B+  AC

 

With a regulated system lights should work all teh time.  Do you or get dimmer as the engine slows down as in shutting it off??

 

New knock offs are $12-20

[pfrederi 17,147]

[pfrederi 17,147]

Kohler has changed their display a bit, used to have a box around the item number if it was used in a spec #  Now they just only show in the description those parts in that spec. but this sure looks like you have a regulator

 

 

[gwest_ca-(File Mod) 10,504]

Toro lists the M10S-461521 3amp used on the following tractors 1987-1991. There is a mistake somewhere.

21-10K804 - 1987 - Wiring diagram shows 3amp unregulated charging system

21-12K805 - 1988 - Wiring diagram shows 3amp unregulated charging system

 

Conflicting info

It is possible the early 1988 310-8 model 21-10K805 used the 1987 3 amp unregulated charging system up to Kohler engine serial 1715900013 (1987 production)

It is possible the early 1989 310-8 model 21-10K806 used the 1987 3 amp unregulated charging system up to Kohler engine serial 1919902923 (1989 production)

 

21-10K806 - 1989 - Wiring diagram shows 15amp regulated charging system

31-10K801 - 1990 - Wiring diagram shows 15amp regulated charging system

31-10K802 - 1991 - Wiring diagram shows 15amp regulated charging system

 

[pfrederi 17,147]

Need a picture of the front of the magnum to see if there is a regulator mounted.  Kohler info may not be accurate either

[gwest_ca-(File Mod) 10,504]

I'm thinking the 461521 spec is not correct for 1989, 1990 and 1991

1992 and 1993 don't look correct either.

 

1987 310-8 model 21-10K804 - Using M10S-461521

1988 310-8 model 21-10K805 - Using M10S-461521

1989 310-8 model 21-10K806 - Using M10S-461521

1990 310-8 model 31-10K801 - Using M10S-461521

1991 310-8 model 31-10K802 Serial 1000001-1999999 - Using M10S-461521

1992 310-8 model 31-10K803 Serial 2000001-2999999 - Using M10S-46154 - Suspect this should be 461545

1993 310-8 model 73320 Serial 3900001-3999999 - Using M10S-46145 - Suspect this should be 461545

 

Kohler made spec numbers 461533 and 461545 for Wheel Horse

 

Copied this from service bulletin 301G

 

The 117254 shows up for 1990 and 1991 at Toro

[pfrederi 17,147]

I agree something is fishy here. Really need a picture of the front of the engine.

[supoc7 0]

The regulator is not mounted on the engine. It's on the right side cowl just forward of the dash.

[pfrederi 17,147]

Well that isn't standard.  So now we have to wonder if you have a 15 amp stator or the three amp. Try to find the wires that come out from the engine and head toward the instrument panel.  There was back then a 3 prong connector.  Looking at the engine side there should be 3 wires One kills the ignition one, I believe yellow, power the lights.  There should be  a small lump in the 3rd wire hidden by the outer cover Slit the cover and see if there is diode in that third wire.  If there is start with step 2.

 

 

[953 nut 51,775]

On 2/6/2024 at 4:41 PM, supoc7 said:

The VR has 3 terminals H,B,S and the number on it is 1046.

That is a part number for a Harley Davidson voltage regulator. My advice would be to abandon that unit in favor of a correct Kohler voltage regulator and follow the Wheel Horse wiring diagram.

[pfrederi 17,147]

More thinking...  If the engine has a 15 amp stator then there will still be three wires but two will be white and one (mag kill) dark Blue.  If it is a 3 amp the wires will be all different colors.

[supoc7 0]

What I did was change the VR to the one that is on the wheel horse Z110 K804 diagram which is  part # 2575503 and all is well now. It's charging correctly. had to put new terminals on the wiring to match the VR. Pfrederi, Thanks for the diagram.

Thank you all for the help.

Edited February 14 by supoc7
To thank Pfrederi and all.