I just bought some 55watt universal fog lights that comes with wiring and switch but no relay. I want to add a relay to the fog light. After connecting the fog light relay, I want to install relays for the headlights so that it would be brighter (one for high beam and one for low beam)

To make the fog lights turn on or off when using the headlight switch, a wire need to be connected from the fog lights to the headlight low beam or high beam. If there are 3 relays and all of them connect to each other, will it burn anything?

(2 relay for high and low beam then another relay for the fog lights that connect to the low or high beam wire)

2 9004 head light bulbs= 50-65 watt each
2 fog light bulbs= 55 watt each
1 30 amp relay for the fog lights with 15a fuse
2 30 or 40 amp relay for the headlights low/high beam

 

Are you still trying to do this;
https://www.camryforums.com/forum/general-tech-8/87-camry-fog-light-install-not-plug-play-5045/

A relay is a switch that uses a small current to switch a large current. You can relay yourself to death as long as the relays/circuit are rated for the amp draw.