I have a Ranch King 13Bi618h205 Riding mower. When I press the reverse pedal while mowing it kills the engine. Where is the wiring for this switch so that I can get the mower to mow while in reverse?

Hi,
If it does not have some bypass switch to make it do it with the deck engaged, It simply will not. Some have a button to push or you turn the key switch to a particular position prior to reversing it and some do not. Deere was the first to come up with and patent a system, but they refused to seel use of the patent.
Peace,
Clarke