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fuse question

Doesn't matter how many relays, you fuse for the wire size.

8AWG wire: You should be good to a 40amp fuse.

Each lamp will draw about 8.4amps.

All 4 lamps would be roughly 34 amps.

I'd use (2) 20amp relays.
 
Doesn't matter how many relays, you fuse for the wire size.

8AWG wire: You should be good to a 40amp fuse.

Each lamp will draw about 8.4amps.

All 4 lamps would be roughly 34 amps.

I'd use (2) 20amp relays.


This is exactly correct. You do need a 40amp fuse and relay.

Personally, I would use two 20amp fuses and two 40amp relays. You could parallel them from the same switch if that is the prefered. In other words, use two lamps on each relay and fuse.

Your wiring diagram is good.
 
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