I've been chasing out the little niggles on my wiring today and last remaining issue is the tail lights.. So they come on when I put it in Park but not when I switch the headlights on. I have power on the red line and power on the red and blue line up until the diode.. I checked the diode was in the correct direction which it is but still won't actually let any power come thru. I checked it for resistance and it's infinite one way and really high in the direction of flow, like 20k Ohms. But is this normal or you think I have a diode issue? I tried removing it and it worked just fine but I'm assuming it's needed. Although not 100% sure why

Cheers
Lee