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The new Carrier 7500 trailer refrigeration units now come with an automatic 'off' switch mounted on the back doors so when you open them, the reefer unit shuts off.
You can override that switch without having to unplug or disconnect anything. Most companies do not know how to do this so they can't share the info with you.
Here's how you override that door switch so you can run the reefer while the doors are open! Enjoy!