The tractor will operate just fine without the preheater. The green wire is used to energize the preheater soleniod and is only &amp;quot;hot&amp;quot; when the switch is pushed. The other wire would be a larger gauge and is connected to the battery post of the starter and will be &amp;quot;hot&amp;quot; all the time. It should be removed or taped up to prevent a short. WB.