Just a question about relays I never use them when wiring on my general, most of what I do is just led lighting so very little current. I use the buss bar and wire from there but do hear you guys talking about relays. Can someone look at this link below and maybe give me a explanation of why and where I should be using relays. I do realize that if you have a big current draw relays are suppose to be used. But just never used them and am not really up on them Thanks.
PS are these the type of relay I would use if one were needed??
PS are these the type of relay I would use if one were needed??

Automotive Relay Harness Set - ELEFOCUS 5 Pin 12V 30/40 AMP SPDT with Interlocking Relay Socket and Color-Labeled Harnesses, 6 Pack : Amazon.ca: Automotive
Automotive Relay Harness Set - ELEFOCUS 5 Pin 12V 30/40 AMP SPDT with Interlocking Relay Socket and Color-Labeled Harnesses, 6 Pack : Amazon.ca: Automotive
www.amazon.ca