Hello. But my cable is ok ~_~ I checked.
My multimeter show 16.5 Volt with "+" into "B" and "-" into "E" on the Amphenol connector.
I also check for short circuit and there is none.
What is actual voltage of light? 12 Volt or 15 Volt? I just ask because I read that some BB-2590 battery will have protection if the voltage is too low. Such big headache. I think I know why old owner of my light not wanted it anymore haha.
You're good on B and E for the connections. The polarity is supposed to be B is positive and E is negative.
The battery connection should be 1, 2, and 3 negative, 4 and 5 positive. #6 appears to do nothing.
My batteries show 16.3 volts. I checked a few of them, so in your case low voltage isn't a problem.
Check the polarity, as the light won't function if reversed.
BTW, very professional looking cables. Good job.
The Hellfighter will operate within a voltage range of 11.5 volts to a maximum of 30 volts. Beyond that and the ballast may make magic smoke.