Question about relay

Hello, non-electrical person here! I have read through many manuals. I’m wondering, does a trailer connector serve the same purpose as a relay? Are these interchangeable?
Thank you!

Hi,
Actually they are very different and have different uses. The relay lets a small electrical current control a larger current. A trailer connector temporarily connects two electrical circuits that do not need to be permanently connected. When modifying cars, we use a relay to allow a switch (like a Big Red Button that cannot handle too much current) to turn on the car’s motor (which takes a lot more current). We sometimes use a trailer connector to temporarily connect a battery charger to the car if it doesn’t come with a convenient charging jack.
Hope this is helpful!
– Doug

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