This is a post from someone else about a known problem with these chargers. someone else also said it was a resistor on the board. maybe it will help someone else !
I had a Delta Q charger failure about 3 years ago. It was a new item that I installed on a Bigman (48V). I was informed (unofficially) that there was a known soldering issue. This information allowed me to fix the problem and continue to use the charger. I have recently sold this vehicle so I don't have access to the charger. After considerable search, however, I found the hand written notes I took at the time. They are as follows: 1) remove charger from vehicle, 2) remove 8 screws on top, 3) remove 3 bottom screws that secure the AC panel, 4) loosen the AC input panel and rotate 90 degrees to access the PC board, 5) locate the current shunt wire located where the PC board meets the LED board, 6) there is a limited amount of solder on one end of the wire (I resoldered both ends). Scrape the conformal coating until the wire is shiny and solder with 60/40 resin core, 7) reassemble by re-rotating the AC panel and install the bottom center screw until flush then complete the assembly.
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