312-8 Wiring Question

[Michael Bullington 5]

There are two wires that plug into the solenoid at the bottom...(looks like a white and black wire) does it matter which wire plug into the plugs? Also i have a ground wire that was behind a bolt that holds on the solenoid onto the brace...i cant not find what this was grounding?

Thanks for all replies!

Michael

[Duff 206]

Michael, hoped I was going to be able to help you out on this one. I just ran out to the shop and checked both my 312-8's. I've replaced the original solenoids on both with newer units that have the terminals on top. For what it's worth, both are wired such that the "hot" side coming from the ignition switch plugs into the left-hand terminal as you look at the solenoid head on. As to your mystery ground wire, no idea. Could you post a picture?

Duff :omg:

[Michael Bullington 5]

thanks Duff....heres a picture...i plugged the bottom wires in...but not sure which prong ???? the ground wire behind the bolt i just cant remember

[buckrancher 2,694]

thanks Duff....heres a picture...i plugged the bottom wires in...but not sure which prong ???? the ground wire behind the bolt i just cant remember

I think that ground wire goes under the battery ground wire on the frame

[btrrg1969 11]

Michael ,

Here's some pictures of mine

Attached Image (Click thumbnail to expand)

[btrrg1969 11]

My PC is acting up bare with me

Attached Image (Click thumbnail to expand)

[btrrg1969 11]

Lilttle red goes to fuse box , big wire to right -battery , big wire to left starter and I have no ground wire , hope that helps

Attached Image (Click thumbnail to expand)

[Michael Bullington 5]

does anyone have a manual for the magnum 312 models?

[btrrg1969 11]

does anyone have a manual for the magnum 312 models?

Are you needing info on the motor?

[Duff 206]

does anyone have a manual for the magnum 312 models?

Michael, go to this link and enter your info. It will let you download the service manual for free!

http://www.kohlerengines.com/manuals/landing.htm

Duff :omg:

[Michael Bullington 5]

hey guys...thanks for all the replies

[Michael Bullington 5]

okay i need help with two more wires....A dark blue wire that comes out of the test switch...its the only wire the doesnt plug into the small circuit board..

Second wire: Its a light blue wire (only blue wire on the board) leaving the board going somewhere ...both of these wires have the double connection metal clip...like they can plug into another connection..

Thanks

[Michael Bullington 5]

okay, let me try an easier one...which way does the battery go,,,poles toward the driver or the engine??

Anyone?? thanks

[Save Old Iron 1,571]

battery orientation is usually dictated by the orientation of the battery wires.

the wires should not cross each other as the battery sits in the holder.

DO NOT GO BY BATTERY CABLE COLOR for identifying positive and negative.

We have just seen a recent case of the tractor having black positive battery cables with negative cables being red.

The negative cable is always connected directly to the tractor frame and possibly the engine block.

[Michael Bullington 5]

chuck thanks for the reply..This wiring is tough when you dont have anything to go by ...What im trying to find out is which way the poles face the driver or the engine.

I know the drivers side is the positive and the passager side is the negitive side..and the positive wire goes to the soilnoid and the negitive wire goes to the frame or engine...

okay to be clearer when you buy a battery the positive pole can be on the left side or the right side..)if you consider the poles are on the front side) who knows which is the front or back...Now seeing that i need the positive to be on the drivers side it...i need to know if the positive pole is closer to the dash side or closer to the engine side..

man i wish i could draw on here

Basically i just need to know which way the battery goes in the 312-8...maybe i can get some pictures to help

[TT-(Moderator) 1,162]

Originally, the terminals would have been on the back toward the dash.

[Michael Bullington 5]

okay maybe this will help....

This way or

This way

Now the postive and neg have no reflect on what im needing...just the direction the battery sit

Thanks :D

[Michael Bullington 5]

thanks TT , you beat me to the punch!!

I wondered where you have been hiding! Also thanks for the spring info,,,it worked out great ...the 89 model actually has a small hole in that brace exactly where that spring was in your photo!! :D

[Michael Bullington 5]

okay if anyone can help me with this wire..i would greatly be thankful..

Ive pulled what little hair i have out today trying to wire this tractor up and after 8 hours im still not even close

and my back hurts from leaning over

it has something to do with the oil light ..it starts at the test switch and connects to another wire somewhere...the 1987-88 wiring shows it going to the relay with another blue wire ....the 89 wiring must be different ...if anyone has a wiring diagram or pictures i would be very thankful

also how does these tractors recharge the battery??

thanks

[Fiddlestix 0]

Go to Toro.com and download the Toro Demystification Guide, It is a huge 500+ page pdf with all these 312 schematics broken down circuit by circuit. It is FREE, it is great, and it is what you need.

Yes, they tinked around with that model's harness nearly every two years. So unless you have another model of the exact same year to compare, it is likely not applicable to yours as a model. Get the Demystification Guide... heck, EVERYBODY here should down load it!!

For those of us watching this...what year is the subject tractor?

[Michael Bullington 5]

Hey thanks this is just the wiring diagram I was needing Ive been to that site many times and never new about that manual!!! ,,by the way this is a 1989 model....

okay lets say I have no oil, Pto engaged, parking brake off, clutch out, and not sitting on the tractor and turn on the key....Will All 5 lights be red on the panel???

[Fiddlestix 0]

it has something to do with the oil light ..it starts at the test switch and connects to another wire somewhere...the 1987-88 wiring shows it going to the relay with another blue wire ....the 89 wiring must be different ...if anyone has a wiring diagram or pictures i would be very thankful

OK...looking at the schematic in the Demystification Guide, it appears to me that this is DK Blu? If that is so, then it should go to the coil side of relay. It appears to have a piggy back spade connector, This means this plugs onto the relay and then the dk blu from one side of the float switch in the engine oil pan piggy backs on this connector. The two wires are tied to one lug of the coil side of the relay (the other side of the relay coil goes to ground. This means this wire sends current to relay when test switch closed. That help?

also how does these tractors recharge the battery??

If you are talking of the Magnum series of Kohlers, there is a stator inside the flywheel which has magnets. This generates an AC current that the regulator/rectifier conditions and sends out by the single white wire coming out of blower housing. This wire then goes into the wiring harness and heads back to the ign switch. Again according to the 312-8 1989 diagram on page 7-28 in the Demystification Guide (aren't you glad you have that now? ) it connects to the accessories lug of the ign switch which sends it to the battery when in "run" position. That help any?

Moderators may move this thread to the newly created "Electrical" forum. :D

[Duff 206]

If you are talking of the Magnum series of Kohlers, there is a stator inside the flywheel which has magnets. This generates an AC current that the regulator/rectifier conditions and sends out by the single white wire coming out of blower housing. This wire then goes into the wiring harness and heads back to the ign switch. Again according to the 312-8 1989 diagram on page 7-28 in the Demystification Guide (aren't you glad you have that now? ) it connects to the accessories lug of the ign switch which sends it to the battery when in "run" position. That help any?

Moderators may move this thread to the newly created "Electrical" forum.

OK, I have to jump in here. I think there may be an error in the wiring diagrams. I don't have the Demystification Guide in front of me, but I do have the Parts and Service manual for the 1989 310-8, 312-8, 414-8 and 416-8, with wiring diagrams for each model. The 310-8 and 312-8 diagrams support what EZ has posted, but the actual wires coming out of both the M12 engines on my '88 and '89 312-8's are purple and white...AND....they don't agree with the printed wiring diagrams.

On my engines, the white wire coming out of each engine is a ground wire for the coil so you can shut off the engine by grounding the coil. The purple wire comes from the center terminal of the voltage regulator on both tractors, and both are putting out about 14.5 volts when the engine is running above 1,000 rpm. Also, the purple wires are 12 gauge, which one would expect from a wire carrying some current, as opposed to the white wires which are only 16 or 18 gauge intended only to ground out the ignition coil.

If you look closely at the wiring diagram, the wire coming off the "rectifier" terminal of the ignition switch feeds the headlights and taillights, which I would call accessories. The terminal marked "DC Accessories" calls for the white wire from the engine (on my engines, the white coil kill wire) to be attached.

And the "Dark Blue" wire coming supposedly from the "magneto" connects to the "M" terminal which only goes to ground when the switch is off, but supplies no operating power to the electrical system of the tractor when the switch is on. If I had wired my tractors according to the diagrams (assuming my purple was dark blue 20+ years ago when the tractors were built), I would be putting a dead short onto my regulator/rectifier when I turn off the ignition switch, and that can't be good!

So either I've got two M12's that came out of the factory wired backwards or something really strange is going on with the wiring diagrams.

For what it's worth, I've connected the white "coil kill" wire to the "M" terminal on my ignition swtches, the purple wire from the rectifier/regulator to Rectifier" terminal, and the lighting circuits to the "DC Accessories", or "A" terminal, which also feeds my hour meter and volt meter. Both tractors run extremely well.

Experts, PLEASE jump in here and tell me if I'm all wet.

Duff :USA:

[Fiddlestix 0]

I am no expert here but agree Duff...the Demysitification Guide is ...uh... Mysterious! That's why I ref'd the exact page. It makes little sense to me. The Magnum Service manual concurs with the color coordination you state .. fig 8-13 on page 8.11 shows the Violet wire as B+ and the White as coil ground. This also is how my '88 310-8 is...on the motor side of the Molex conector. It changes after that to a different set of colors which I cannot recall at the moment.

[Michael Bullington 5]

Duff you are correct...the white wire is the kill wire that goes to the mag....There is a second white wire that changes color once it goes through the pig tail from the ign...i think that what fiddlestick was talking about...

Im getting closer by the day....all this information is helping...

I cant get my my mind around that dark blue wire Quote:

And the "Dark Blue" wire coming supposedly from the "magneto" connects to the "M" terminal which only goes to ground when the switch is off, but supplies no operating power to the electrical system of the tractor when the switch is on. If I had wired my tractors according to the diagrams (assuming my purple was dark blue 20+ years ago when the tractors were built), I would be putting a dead short onto my regulator/rectifier when I turn off the ignition switch, and that can't be good!

Doent this wire have to become hot a some point..This wire travels from the mag to the mag prong on the switch, then it goes to the bottom pto relay swtch...is the dark blue a ground wire only?? for some reason i cant understand this wire

One more question,,,where does the pigtail mount ,,,it looks like it has two screws that hold it somewhere?