ColdNoMore, you have good points, I forgot to mention alarms like the ones I mentioned are over $100 without installation, and do have a constant drain on the battery. Also, if the OP was looking for an alarm for an electric cart, the alarms I mentioned may not be suitable unless there is a suitable 12 VDC source. I agree with the hidden kill switch approach, as this would be the least expensive way to go.
Finally none of these approaches prevent someone from simply rolling the cart to a trailer and leaving with it.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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