If your installing an Engel fridge into your truck you can swap out the origional lighter plug to a 'lockable' marine grade one like this :
http://www.marinco.com/product/sealink-12v-plug-amp-receptacle
The Engle 'temperature fuse' will fit the plug and you get the huge benefit of it not being able to vibrate loose with all your beer in the fridge
http://www.marinco.com/product/sealink-12v-plug-amp-receptacle
The Engle 'temperature fuse' will fit the plug and you get the huge benefit of it not being able to vibrate loose with all your beer in the fridge