Wiring help?

[JD2030]

I am currently trying to install a 16 hp twin cylinder B&S into an older Murry GT with the cast iron rearend (originally had an 11hp brigs) there are three wires coming out of the front of the engine one I think is the kill wire (yellow) but the other two that go into a plastic plug are they for the charging system? If so what mods do I have to do to the old wiring that is in the tractor? If possible where would I find a wiring diagram for the 16hp? I don't need any safety switches because the tractor will only be used for pulling and nothing else. Any and all help will be very much appreciated.

[Maybar]

I am currently trying to install a 16 hp twin cylinder B&S into an older Murry GT with the cast iron rearend (originally had an 11hp brigs) there are three wires coming out of the front of the engine one I think is the kill wire (yellow) but the other two that go into a plastic plug are they for the charging system? If so what mods do I have to do to the old wiring that is in the tractor? If possible where would I find a wiring diagram for the 16hp? I don't need any safety switches because the tractor will only be used for pulling and nothing else. Any and all help will be very much appreciated.
__________________________________________________ ____________

If one of the other two has a swollen lump (diode) kind of sort of thing just before the plastic plug it is for changing A/C to D/C for the charging / cranking system. The one without the (diode) is A/C voltage for lights.

[JD2030]

Ok thaks that will help I wasn't for sure what each wire was for.