As a mouse biologist (really), I always wonder why folks feel the need to kill everything that inconveniences them using unnecessarily cruel methods (that includes sticky traps and poison by almost anyone's standards that stops to think about it). I expect it from city folks I guess, but I always thought folks that live in the country were a little more accustomed to the real world. No, I don't much like it when mice kill off my car's electrical system, but heck, if I kept a bit neater garage that wouldn't have happened.
A few suggestions about bait for kill traps - cheese is just expensive and a product of fairytales, not reality. Generally some sort of grain, oatmeal works great, made into a paste, with or without peanut butter, works really well. Sticks well to the treadle of the trap, doesn't go bad very fast at all, and it's cheap, not to mention **** effective.
In any event, predator pee won't work - got the tests to prove it myself. They condition to it really fast.
Lights help. but removing cover is better. I know some folks can't be bothered, but if you want to deal with a recurring problem, that's the problem. Don't make great habitat and then expect nothing to use it.
Cats are a bit PITA and killers of lots of non-target species you might actually like (such as cardinals for instance) or would rather kill yourself (like quail). But then again, why not just kill everything - so much simpler (sorry I get a bit cynical sometimes). I used to work on deer and remember all the suburban soccer moms that wanted us to kill all the deer, because they made the world too dangerous for Little Johnny and Jane.
But the best solution is to hunt around for wiring and tubing that has been made with an embedded compound that is extremely distasteful to mice. It is available, and not even uncommon, but not often well labeled. Just search around for what you are looking for in the "rodent proof" or "rodent resistant" variety and you should be good to go. That's pretty easy for most plastic tubing solutions. Wiring harnesses on any modern, well thought out tractor should already have rodent resistant wiring harnessed built into them. Just as the dealer; I'm sure they are all knowledgeable about those features ( not
).
Anyway, I prefer to deal with the cause of the problem, not the symptoms, and the mice are a symptom.