M-18 in my 782..??
 

Has anyone swapped a M-18 into the 782? If so, can you give me some help? I'm having a time getting the ignition switch/ignition to work.

The ignition switch for a 782 and the one needed for a M-18 are totally different.

There are two different wiring diagrams for the 782 model. depending on the Chassis Serial Number. If you supply your serial number, I'll send the correct wiring modification for your tractor.

FWIW
In a nutshell:
The m-18 requires a ground position to kill the mag.ignition.
Your oem switch provides power to a ignition coil or no power to the coil to stop the engine.( M-18 does not use this system, it has a mag)
The start terminal will remain the same.
There are several ways to go about this, one involves a simple relay,
and several articles here relating to this, just use the search feature.

let's see if I can link the diagram for the wiring change.

My 1712 has a M18 and to start the tractor you turn the switch on and it has a toggle switch for the mag. Vice versa to turn it off. Seems to work fine.

With help from Aj, short bed, and someone else, name has slipped my mind, engnieer for cat, I have one in my 582 and you all have seen the command going in Dannys 482. I wired mine like Ajs dia.

Thanks for all the responses. its number is 690876, which makes it an '81 i think. the engine serial is 2613402836. i have a relay, but the diagram i have, i dont understand. my father also said "lets just use a toggle", but i want to keep "Big Red" as it has affectionaltly earned the name, as close to original as possible. any help you guys can give is greatly appreciated.

ive also heard that a 582 harness will wire right up??

aj, that is the diagram that i have, but i dont understand the ignition switch??

thanks again, jon

Now that we know that you have a IH built 782, I have sent you a full size Wiring Diagram to the E-Mail address listed in your profile, with the slight modification needed to accomplish the M-18 retrofit.

I have attached it here also.

Jon, I would go with your instinct and NOT use a toggle. The relay is simple to wire in and like you, I wouldn't want it to look Jerry Rigged.

Jon basically what you do is add the relay between your tractor wiring harness and the motor wiring harness. Most people mount the relay either on the firewall or near the intake on the engine.

On the relay, terminals 86 and 87A both go to ground. The purple wire that went to the coil connects to terminal 85, and the white wire from the motor goes to terminal 30.

Basically what you are doing is when the ignition switch is turned off, the relay connects the white wire from the engine to a ground. When you turn the ignition on, the white wire will connect to a open terminal on the relay so that the white wire is no longer grounded. Grounding the white wire is how you kill the engine on magnums.

AJ

WOW, you guys are awesome. im going to print this info out and make a plan. hopefully ill have it done by next weekend. my 25th class reunion is this weekend and my best friend from high scholl will be coming in so i wont be able to do it this weekend. ill definately keep you guys updated. if anyone else has anything to add im all "eyes".

thanks again, jon

i was out in the garage studying and i found that the diagram the AJ posted has the relay being pn 725-1375 and the info roland sent has the relay being pn 725-3040. can i use either? i already have 1375. the diagram on the sides of the relays are slightly different. the box with the diagonal line thru it has what looks like a bypass around it on the 1375 where as the 3040 does not have this line. other than that, everything else is the same. i hope you guys understand what im saying, i am very simple when it come to electronics.

thanks again, jon

As long as it's a 5 pin relay with all the same numbers, it should work.

AJ

A 4 pin relay will not work!

AJ

thanks everyone. i ended up taking the relay to advance and picking their heads. ends up the line i was wondering about on the schematic represents a resistor. they said both relays are the same, just a different pn and schematic.

RELAY UPDATE.... The 725-3040 ------> 925-3040 is now No Longer Available from Cub Cadet.

The 725-1375 -----> 925-1375 is a suitable replacement.

Best as I can see, both were made by Bosch and using the same terminal configurations. I am only speculating, that the only difference maybe the contact rating of the internal points.

Thus, you can use the 925-1375 and wire it the same as to the diagram that was sent to you.

:ThumbsUp:

Cub wants a arm and a leg for their relays. I always go to napa and ask for a 5 pin relay. Here are some part numbers:

Mag Relay AR201 or ECH AR272, ECH AR143
Relay Harness 9185 or ECH EC38

AJ

Of the ones AJ listed, this is the best match. It has a Mounting Tab...ECH AR143

I have used the one Roland posted...it was only like $5 or something like that.

If you get it at the auto parts store, have them look in there book and get you a one piece plug for it....most I have seen come with short pieces of wire preattached to it, you just have to add more wire to it to put it in the tractor. They aren't expensive and make the wiring job look much more porfessional over the alternative of having 4-5 separate wires attaching to it, plus if you ever need to replace the relay, you simply unpulg it and plug in the new one!

A big thanks goes out to everyone. westofb, Thanks for the advice to get a plug. I was wonder about that. I'm going to research that tomorrow. I mowed part of my yard today, & will mow the rest probably this weekend. I love that tractor.

Jon

If you look at the NAPA part numbers I posted, there should be numbers for the plug also.

AJ

thanks for everybody's help. I spent some time today on my project and i have two issues.

1. I already have a Cub Cadet relay, p/n: 925-1375 which is a Bosch. It has a number 0 332 209 150 on the top that I think might be a p/n but I haven't been able to track it down over the net yet. I went to NAPA today and found the plug, but the "hanger" on the Bosch/CC is on the opposite side of the NAPA plug. i would just return the Bosch/CC but its probably too late, we will see. I'm going to try tomorrow.

2. I studied the diagrams and my tractor today and I still have questions. To keep it simple I have two wires coming off the M-18 engine. A gray one from the rectifier/regulator, and a white one from the ignition module. I also have from the tractor bundled together in a harness to a three pin plug a purple, purple/white, and a light blue or light green (i cant tell) wire.

Besides me not being very good with electronics, the tractor came with the M-18 in it. Everything was jury rigged, it currently has a wire running from the tractor, LT blue wire (that is bundled with a violet and violet/white wire to a 3 point plug), to the rectifier/gray wire. I turn the tractor off by grounding the ig. module/white wire. One thing I have noticed is that the battery isn't being charged, I guess it has something to do with only one wire from the tractor being connected to the engine.

Anyhow, help is always greatly appreciated.

thanks again,
Jon

How about some pictures of:
* This three pin harness connector (PUR. PUR/WHT, & BLU)
* The the 925-1375 Relay
* The NAPA harness plug you bought

:WWP:

In addition...what is the Kohler "Spec" number on that M-18 motor...??
What are the color of the two wires coming from the M-18...??
:HeadScratch:

Any updates?:bigthink:

hi all,

i picked up the relay "socket" today from napa. i also compared the bosch/ccc relay to the napa relay and they are the exact same.

unfortunately im also technologically behind the curve as well. as a matter of fact i just downloaded software for a digital camera that my wife got me for christmas 2 years ago last week. i havent got to using the cam yet, but will in the near future. i tried down loading pictures from napa of the relay and socket but was unable to transfer them to this mail. anyhow pictures will be coming in the near future.

for the engine:
model # M18S
spec. # 24500
serial # 2613402836

not to add to the confusion, but i made a mistake in my previous post where i said that i had a three pin connector wire coming from the tractor, that was a wrong statement. i have a two pin connector wire coming from the tractor. the two pins in the connector are perpendicular to each other, or in the shape of a "T". the lt blue wire connects to the top or the horizontal pin. the purple and purple/white are connected together to the pin running vertical in the "T".

there is only two wires coming from the motor. a gray wire that is coming from the middle pin on the regulator-rectofier and a white wire the comes from the ignition module.

basically i have two wires that will go to the relay from the tractor and two wires that will go to the relay from the engine. i might fiqure this out yet, it seems straight forward??

as usual, any help you guys can give will be greatly appreciated. even if i get it hooked up im not going to start it right away without input from you guys. with my luck, i would burn something up.

jon

Purple wire on the tractor harness goes to pin 85 on the relay.

Lt. Blue(Should actually be grey) wire on the tractor harness goes to the grey wire on the motor harness.

White wire on the motor harness goes to pin 30 on the relay.

Pins 86 and 87A on the relay both go to ground.

AJ

ok, im runnig into some problems now.

i know that the white goes to pin 30 and the purple, purple/white goes to the 85 pin. that leaves me with two wires that can go to either 86 or 87a. i also know that pin 87 can not be used. this is what i know according to both of my diagrams.

what i dont know is where the gray wire from the magnito or the lt blue wire from the tractor goes. i dont know how to read schematics but im guessing from what i see on both of my diagram that both wires can go to either pin 87a or pin 86??? im guessing the ignition switch takes care of the rest???

give me some help fellows. im struggling.

jon

The grey wire connects to the lt. blue wire. Both 87A and 86 go to a ground.

To wire up the relay, would be exactly as to the diagram that was previously sent to you. I have exploded the relay portion of that diagram...

thanks alot guys, im going to get it workin this weekend. i also have a oil sensor light that im going to get hooked up and it will be sweet. ill keep you all updated.

jon