It seems some folks have had good luck with suitcase connectors, but in my experience they should only be used with a tailgate warranty, when you can't see the tailgate of the installer as they drive away any more, the warranty expires. If you do use them I like the type that are filled with dielectric grease that helps limit corrosion, I've never seen a contact failure on that type. I've never actually used suitcase connectors for layout wiring, only in automotive applications, usually remote start installs. I grew to hate these connectors after the 3rd or 4th time I had to diagnose a remote starter that stopped working. Over all, they are a poor choice for anything carrying more than signal-level current.
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