HELP NEEDED FOR WIRING KOHLER ENGINE SWAP

[Colimotl]

HELP NEEDED FOR WIRING KOHLER ENGINE SWAP

I have a Cub Cadet tractor SuperLt 1554
Model: 13AK11CK712
Serial: 1D075H30108

and I am in the process of replacing a damaged 27 hp Kohler engine
Model: CV740S
SPEC NO.: CV740-0026
SERIAL NO.: 3508021671

with a new 23 hp Kohler engine
Model KT730 DISPL (CC) 725
SPEC NO. KT730-3012
SERIAL NO. 4409307693

I have everything completed and am ready to hook up the wiring. QUESTION: Can I safely hook up the matching connector from the tractor to the connector from the engine?

I believe that both the 27 hp and the 23 hp engines have a 15 amp alternator.

Below is information concerning the ignition switch:

From the Cub Cadet Service Manual: The Key Switch is similar to those used in a variety of MTD applications since 1999. The difference in this case is that it is incorporated in the same housing as the RMC module; the two items are not available separately.

In the OFF position, continuity can be found
between the M, G, and A1 terminals.

M is connected to the magneto by a yellow wire,
G is connected to ground by a green wire, and
A1 is connected to the after fire solenoid and
alternator.

In the OFF position, the magneto primary windings
are grounded, disabling the ignition system.
The alternator output that normally keeps the
after fire solenoid powered-up is given a more
direct path to ground, depriving the after fire
solenoid of power. This turns-off the fuel supply.

Any assistance will be greatly appreciated.

 

[ILENGINE]

Check the positions of the wires between the old engine and the new engine. I suspect they are the same positions, because they are both Kohler, and normally you run into wiring issues, when changing between brands, not within the same brand.

 

[bertsmobile1]

As per previous post.
But to be safe follow the wires from the ignition coils to the plug ( usually a white wire ).
Then test between that wire in the mowers plug & ground.
It should show 0 v at all times and go to ground with engine turned off be open circuit with engine turned on.

 

[Colimotl]

Thanks to both ILENGINE and bertsmobile1. One concern that I have is that when I attempt to connect the molded connector from the switch to the molded connector from the engine, the colors of the wires do not match. See the drawing below:

 

[ILENGINE]

You are over thinking this. Look at the connector on the old 27 hp and the connector on the new 23 hp engine, do the wires go to the same locations on the engine. The main wires would be the purple, white, and red. Red should go the fuel solenoid, white goes to the ignition modules, and the purple goes to the voltage regulator. if those wires are in the same position in the old engine and the new engine then you should be safe.

 

[Colimotl]

Thanks ILENGINE; however, I no longer have the 27 hp Kohler Command to compare the wiring.