Outside of the obvious (30A draw etc) ........ when should you use a relay ?
I am planning on putting both of the devices on my truck. I have spared fused circuits from my EZ harness. Debating on plugging straight into them or adding relays. Both products below recommended relays.
~7.5A fused
https://www.amazon.com/Audio-Systems.../dp/B00IBI50NK
https://preview.tinyurl.com/y7v839y5
~ 3A tested with multimeter
So this got me thinking - I know the basics of relays and how to wire them ...... but why use them for those mid level draw accessories ..... 5A-10A. Cant these be protected adequated with correct gauge wire and fuse ? I mean there are plenty of 5-15A circuits on these wiring harnesses ?
I know would need to measure length of wire an guage to ensure could carry load ...... but outside of that ?