1995 MTD 1846 Ride-On Mower Ignition Issue - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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Old 05-04-2012, 09:20 PM   post #1 of 52
831mtd
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Default 1995 MTD 1846 Ride-On Mower Ignition Issue

Hello,
I was given a 1995 MTD 1846 mower that supposedly runs but is missing the ignition assembly. All the wires (5 of them) seems to be ready to be plugged in to a new ignition. I recieved the ignition today and there are 5 plug-ins (so far, so good). The electrical connections on the back of the ignition are marked S, M, B, G, and L. Do these letters correlate to the colored wires somehow??

I'm stumped here and can't seem to find anything on the web.
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Old 05-05-2012, 09:14 AM   post #2 of 52
Chagrin
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

S = Solenoid (supplies battery + to small nut on solenoid)
M = Magneto (the kill wire from the coil)
B = Battery (+ side)
G = Ground (- side)
L = Lights (+ side)
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Old 05-05-2012, 12:12 PM   post #3 of 52
38racing
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

colours might be s -yellow m-black B-red L-blue G-green but you really need to use a vom to be sure. If you put 12volt on that M terminal you'll burn out the magneto
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Old 05-07-2012, 01:17 PM   post #4 of 52
831mtd
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

I'm a complete rookie here with electronics (and mowers). I'm not sure how to find the solenoid and the magneto.

Here's a picture of what I've got. The black wire runs to a fuse, what would that be?

http://i6.photobucket.com/albums/y21...G_7799-001.jpg
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Old 05-07-2012, 08:43 PM   post #5 of 52
hoot
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

Here are a couple of pictures of the conector on my 1995 800 series tractor. These are looking at the back of the switch. Yellow at the top with orange then red on the right, Black then green on the left. Hopfully these will help.
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Old 05-08-2012, 12:32 AM   post #6 of 52
831mtd
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

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Originally Posted by hoot View Post
Here are a couple of pictures of the conector on my 1995 800 series tractor. These are looking at the back of the switch. Yellow at the top with orange then red on the right, Black then green on the left. Hopfully these will help.
Thanks, but my ignition looks like this:

http://i421.photobucket.com/albums/p...el/430-538.jpg

There are 5 "sockets" and I have 5 wires..... hmmm.
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Old 05-08-2012, 10:29 AM   post #7 of 52
38racing
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

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Originally Posted by 831mtd View Post
Thanks, but my ignition looks like this:

http://i421.photobucket.com/albums/p...el/430-538.jpg

There are 5 "sockets" and I have 5 wires..... hmmm.
what are the wire colours in the plug positions. I have a 95 handbook with the wiring schematic. we should be able to determine if plugs matches your switch

you say 5 wires but by chance is there a red and black that go into same spade of plug ,plus a yellow, green, and another red that use 3 other spade spots? If so, does black/red correspond to B spade on switch, and then yellow would be M , green would be G, and the lone red would be S

and I also note manual says ignition switch is 725-0267 and my supplier of 430-538 shows it as the replacement.

Last edited by 38racing; 05-08-2012 at 10:42 AM.
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Old 05-08-2012, 11:05 AM   post #8 of 52
831mtd
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

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Originally Posted by 38racing View Post
what are the wire colours in the plug positions.
The mower came without an ignition so I never got to see anything plugged in. That's my problem, I just don't know which wire goes to which socket on the ignition.

This picture (the same as above) shows what wires I have:


http://i6.photobucket.com/albums/y21...G_7799-001.jpg



Quote:
Originally Posted by 38racing View Post
I have a 95 handbook with the wiring schematic. we should be able to determine if plugs matches your switch
That might be helpful!

Thanks everybody for your efforts in helping me out here! It seemed like it would be so simple once I got the ignition, but might just have to run it down to the mower repair guy to make sure I get this right. If I could just see a photo of how someone's got theirs plugged in that should do it. Can't find any photos on the web!
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Old 05-08-2012, 01:10 PM   post #9 of 52
38racing
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

Quote:
Originally Posted by 831mtd View Post
The mower came without an ignition so I never got to see anything plugged in. That's my problem, I just don't know which wire goes to which socket on the ignition.

This picture (the same as above) shows what wires I have:


http://i6.photobucket.com/albums/y21...G_7799-001.jpg





That might be helpful!

Thanks everybody for your efforts in helping me out here! It seemed like it would be so simple once I got the ignition, but might just have to run it down to the mower repair guy to make sure I get this right. If I could just see a photo of how someone's got theirs plugged in that should do it. Can't find any photos on the web!
Ok, sorry I missed that you have 5 individual wires that are not in a black plug which then goes on the switch. When it quits raining I can check mine but it's an 85 but wiring stays pretty constant within a manufacturer from year to year. If you can trace where the wires go it can be sorted out.
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Old 05-08-2012, 01:26 PM   post #10 of 52
38racing
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

ok, so the 800 pic it have has no orange. i checked the 600 series. it as orange,yellow,red,green and black on the switch and the black goes to a fuse via the ammeter.
check for this as well
does orange go to clutch switch?
does one yellow go to clutch switch and one to either of pto switch or to engine coil .
does red go to engine alternator?
does one of the greens go to the lights (-ve side, + side is blue) and the other to some grounding point?

later tonight I'll scan the the schematic and upload it for viewing

Last edited by 38racing; 05-08-2012 at 01:36 PM.
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Old 05-08-2012, 04:30 PM   post #11 of 52
hoot
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

Here are the colors of wire to each terminal on the switch on my 1995 800 series tractor

B black
M yellow
S orange
L red
G green

Hopefully this will help
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Old 05-08-2012, 09:38 PM   post #12 of 52
38racing
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

Quote:
Originally Posted by hoot View Post
Here are the colors of wire to each terminal on the switch on my 1995 800 series tractor

B black
M yellow
S orange
L red
G green

Hopefully this will help
that would be consistent with the 600 pic in my book. Black is from battery via a fuse and ammeter. Red is alternator DC. I expect the key switch connects them only in 'on' position. On some makes they are together on the same switch terminal so always connected. M,S,G are all consistent.

Update; Just read a thread elsewhere that says L stands for 'load' not lights. Makes sense with the alternator/battery using it. The G for lights I expect is to have the key switch control the light circuit to ground so lights will go out when key is off to prevent battery drain if the regular light switch is left on. I have a Noma that has a key switch that has a position for lights but those are DC lights , not AC like the mtd here. But since they are AC they won't stay if key is off because the engine needs to be running. There goes my theory on the light grounding via the key.

Last edited by 38racing; 05-08-2012 at 09:45 PM.
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Old 05-09-2012, 12:24 AM   post #13 of 52
Bernard Camarro
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

the ground on the switch is for shorting out the mag to shut down the engine.When you turn it to off the light circuit is opened .
This is how mine work
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Old 05-09-2012, 12:38 AM   post #14 of 52
38racing
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

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the ground on the switch is for shorting out the mag to shut down the engine.When you turn it to off the light circuit is opened .
This is how mine work
If lights run on the ac from stator there is really no point in key switch being involved since there is an on/off in the ac light circuit. I suspect since the keyswitch needs a good grounding route to ground the coil, so it connects M to G and G has the green lead going to a good ground point. Then so lights have a good ground they go to the same good grounding spot. To save wire they run the light wire as far as keyswitch and join on the G spade to that other lead to the good ground. Just my theory.
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Old 05-09-2012, 01:08 AM   post #15 of 52
Bernard Camarro
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Default Re: 1995 MTD 1846 Ride-On Mower Ignition Issue

use an om meter and check out the different terminals to one another to see what they do to one another in the off , start and run positions .
bat to sw would connect to starter sol,run position let lights work , off should connect to mag to shut down.

5 term 1 mag ,2 gnd,3 lights 4starter,5 bat this should be what the 5 ter are used for not in this order though
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