Horn Relay and leaking amps from battery

[paulnobodyimportant]

Ever since this Rally build, something has caused my battery to leak at 0.18amps. After methodically going through the wiring to eliminate leaks, it looks like it comes down to how I may have connected my horn relay. (horns are twin 12v horns)

My thoughts are that I should connect 86 on my relay to the yellow wire between the horn and switch. I think that because I have connected to the grey live feed, there may be a small current passing through the relay. (Note, I have isolated the grey wire from the brake switch to isolate any cock up with those flimsy brake switches.

Any comment would be gratefully accepted, see my wiring below which is 12v DC.