I posted a while back about needing a new battery carrier after putting a battery in backwards and, basically, melting two of the negative wires. I soldered two new springs on and measured 8.1 volts on the carrier. When in the light only the switch light comes on. I waited until I got the new carrier and the same thing. Different batteries makes no difference and using those batteries in a Sofirn Q8 work fine. I get 8.1 volts across the red and black at the LED. When I turn the switch on I get 8.1 across the black and white. It’s as if the LED has stopped working.
Any thoughts on an easy fix? It’s seen very little use and is only a couple years old.
I dont own a Thrunite V42, but if I remember correctly there are two versions of this light. Version 1 (led XHP35 HI / 2P2S carrier) and version 2 (led SBT 90.2 / 4P / no carrier).
Your carrier should lead to 8.4V. So that is okay. If the light does not turn on, there might be more trouble in Paradise than you anticipated.
The original TN42 had a xhp35 so 12 volts to the LED is what you should be seeing. You can check by connecting the battery, turn the switch on, and measure voltage across the LED wires. You need to remove the driver to do this or get the bezel and reflector off to get to the bare contwcts on the mcpcb. If it’s not 12 volts, you may have killed the MCU or boost controller.