There’s a “snubber” circuit connected to the relay contacts. This prevents sparks inside the relay, and eliminates electronic noise when switching high and inductive loads like motors. (Routers, dust collectors, compressors etc.) But, this also can create a tiny leakage current. If you attach a really low wattage load like a LED light, it might flicker or slightly light up the light in the off position. If you encounter problems like this, you can use a small wire cutter to cut the snubber resistor-leg for that relay to eliminate this problem. The snubber circuit isn’t necessary anyway for peripherals like led lights. Cut the leg from the resistor as near to the PCB as possible so you can easily solder it back on if you want to restore it in the future. Cut for Acc1 Relay Cut for Dust Collector Relay Cut for Acc2 Relay Cut for Router Relay