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  #1  
Old 06-17-2019, 06:01 PM
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Default CCC 782 w mag 18 problems

Got a 782 with no motor a while back. Got a magnum 18 and got it wired up. It’ll start when touching solenoid contacts. Swapped a known good solenoid and still same issue. When it does run it wants to run away on me. Have to pull plug wires to kill it. Engine only has two wires not the three to plug into harness. One is the white wire that runs from the mag and the other runs from under the manifold. Any ideas of where to start? Thanks
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Old 06-17-2019, 06:40 PM
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was told wiring harness is from 1806. Tractor has front remotes and 3 point, aluminum rear
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Old 06-17-2019, 07:35 PM
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The white wire coming out of the grommet with the plug wires, on the cooling tin is a magneto ground wire to stop the engine when the key is turned to the
"off" position.
If you have the original wiring harness and switch for a 782 you need to make a slight modification to the magneto stop circuit of an additional relay to ground the magneto.
it is an easy modification.
Or an ignition switch from a later cub with Magnum engine, and wired properly.
As far as starting the engine,
you have to have power to the starter sol from the ign switch.
Also, there are safety start switches in the circuit that need addressed as to if they have been bypassed
previously or not working properly, for it to start with the key switch.
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Old 06-17-2019, 09:07 PM
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I have two magnum repowers. One is an M12 and it has two wires. A purple and a white in the harness. White is the kill and purple is the battery.

The other is an M18 and it has three wires, a white, thick black, and think black. White is kill, thick black is battery, and thin black is the oil sensor. If you have two wires you probably don’t have an oil sensor.
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Old 06-17-2019, 09:48 PM
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Quote:
Originally Posted by Rmowl View Post
When it does run it wants to run away on me.
Explain this a little more. You mean the engine RPM goes really high? Sounds like the dreaded governor gear issue.
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Old 06-21-2019, 07:00 AM
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Quote:
Originally Posted by CubDieselFan View Post
Explain this a little more. You mean the engine RPM goes really high? Sounds like the dreaded governor gear issue.
I saw the engine run on a bench, so I know there’s no gov issue. At a total loss here
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Old 06-21-2019, 07:32 AM
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We need a little more info here so we can help.
You prolly figured the need to stop the engine with the white wire,
and some understanding of the start system?
Have you hooked up the throttle control cable properly?
If not, it is possible you are not allowing the gov to work properly.
post us some pictures and the fellows will help.
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Old 06-21-2019, 01:50 PM
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Tractor has a wiring harness from an 1806. The only thing that differs from it and my other 18 mag powered machines is it is lacking a plug on the bottom of the relay. And only two wires coming from engine. Also that piece by the hydro control lever is towards the end of the harness I mounted it by the battery. I tried several different ignition switches. First picture is the relay that lacks the bottom plug in the harness. Middle picture is that hydro control lever switch. Bottom picture is the two engine wires plugging into the 3 prong terminal
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File Type: jpg A411ACD1-B4A7-4EC2-B4E8-1A591422428D.jpg (11.2 KB, 144 views)
File Type: jpg FB75761D-A499-411A-8FFF-4E747C8D6036.jpg (21.6 KB, 145 views)
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Old 06-21-2019, 02:48 PM
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ok,
you are going to have to do a little detective work following the wire harness schematic and figuring what you have as far as harness wires and where they go.
As far as the motor harness as been said, the white wire is the kill, it needs to go to a "ground when off" on the IGN switch if it has one, if not you will have to add a simple aftermarket relay to do that.
someone here will prolly direct you to the relay post as I remember seeing it in the past.
the other motor wire which is heavier, is prolly the feed from the charging system rectifier (center terminal) and will provide 12V for recharging the battery .
I don't have the wiring diagrams off hand for your harness so I cannot help much further but I'm sure others will chime in here to help.
Roland is awful helpful finding that stuff and will prolly be along to help.
it is a little more difficult when the wiring harness you have is not the original 782 and I'm taking an educated guess that you have the later 782 with the more complicated safety relay and backup relay.
If I were there it would be simple ring things out, and figure what we have to work with but we are not.
While just plugging wires into a corresponding like plug, is a good try it sometimes just don't work that way, as you have found.
it is not overwhelming as getting 1 wire at a time in the right place is all it takes but it is time consuming.
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Old 06-23-2019, 10:25 AM
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Did you ever figure this out? I have a good CCC 682 harness (it has a couple splices on the PTO wire) if you want to see pictures of it for a reference or if you want it I can throw it in the mail. I think the question asked earlier was to determine if you meant the engine runs and won’t turn off with the key, or if the RPMs go up on it’s own and you have to kill the engine. The no-start with the key might be the two wire side of the PTO switch, or incorrect ignition switch.
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