I think I figured it out. Thanks to "bigcat" pictures.
I would realy like to know what the designers at Whelen were smoking when they came up with this one. Why....oh Why do you need to put 2 seperate hot and grounds to the same damn control board. One is to power the strobes and the other for the halogen accessories.
Reminds me (if anyone has worked on fire alarm systems) of the pyrotronics system 3. I would like to know what bong head came up with this idea. Lets mess with all the technicans by having end-of-the-line capacitors instead of resistors. How many mulitmeters do you know that have a cap check? All of them read resistance.