twl911
Member
I have an older Whelen UHF2150 HLF. It has the two wire loops coming out the rear of the flasher. I know there are 4 possible flash patterns based on how those 2 loops are either cut or connected but I cannot find a diagram showing how to treat each wire for each pattern. As it is from the factory, both loops are intact and it provides an alternating (I believe) 120FPM. I would like to set it at the slower 90FPM alternate but don't know which wire to cut?