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Finally got my clearance LED lights installed, with custom wiring. Front lamps are Grote G5053 surface mounts, rears are Truck-Lite 33075R flush mounts. Fronts were mounted just forward of the front roof rib, just back from front slope, equal spacing side to side. Rears were mounted above door line, outside of large seam. [30 mm above frame, 620 mm out from edge of 3rd brake light] A few Rolaids before drilling a 3/4" hole with a hole saw helps... All lights driven from tail light circuit (red 18ga), grounds also through tail light circuit (black 18ga). The trick part routes the grounds for the left most and right most markers through a NC relay that lifts the ground when the signals are used, causing the marker to flash out of phase with the signal. All other markers stay on. (yellow 18ga=left, med green 18ga=right) {note - there is a lighter green as well as a green w/trace in same bundle - double check with volt meter all wires} 5 pin relays must be used, in my case Ford type relays were used (came out of a '05 Taurus at my local pick-n-pull salvage yard- 1$ each), Bosch type relays will work just as well. The only difference is the pin identification. Ford numbers 1-5, coil 1,2, 3 is the feed, 4 is closed, 5 is open [NC uses 3,4; NO uses 3,5] Bosch type - 85,86 are the coil, 30 is the feed, 87a is closed, 87 is open [NC uses 30,87a; NO uses 30,87] T-taps were used on the main harness along the ceiling behind driver seat. NV HD signal mod-Model.pdf