Wiring Schematic for Off Road Led light w/ Push Switch and 5 pin Relay

So I realized that my switch, light, and relay all came without a wiring schematic and thought it would be helpful to create one for people that are getting their feet wet in automotive electronics. I used a 3amp Push Switch, a 5 pin 40amp automotive relay w/ a 30 amp inline fuse, and 2 18w led flood lights. For simplicity, I used my parking lights as my 12v power source. If you have any suggestions, please let me know!
Thanks,
Eric K

 

This will be a good reference since there are lots of questions related to wiring up lights on this forum.

The fuse between +12V and switch green on the schematic only needs to be rated for an amp or two. When the relay is energized only a small amount of current flows between pins 86 (battery positive) and pin 85 (battery negative / ground).

Current to the lights flows from pin 30 (side of relay which connects to the power source) to pin 87 (where lights connect) when the relay is energized. An inline fuse should also be placed between the battery voltage source and pin 30. This fuse should be rated appropriately for the lights. In your case I believe you tapped power from the parking lights so this wiring is already fused. If someone were to run power directly from the battery they would need an inline fuse between the battery and relay pin 30.

Selecting the correct thickness (AWG) wire is also very important. The wiring should be able to handle a current greater than the fuse which protects the wire, otherwise the wire becomes the fuse and bad things could happen.