Older Whelen UHF2150 HLF, non scanlock flash patterns

twl911

Member
May 21, 2010
83
Vermont, USA
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?
 

shues

Lifetime VIP Donor
May 21, 2010
10,294
NW Indiana
The pattern selection is supposed to be the same as on the UHF2150B:

6xjUuZJ.png


Source: https://www.whelen.com/wp-content/uploads/2020/08/13531.pdf

In fact, I had an older copy of 13510.pdf from February 16, 2000, which I have uploaded, here:

UHF2150A-Headlight-GrilleLightFlasher_install.pdf
 
Last edited:

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