Despite all the caution I tried to apply when pugging my connectors, I managed to make a mistake. I have a 10S turnigy (4Ah) battery where the 10S balance wires are separated in two 6pins connectors. Therefore one pin in common.
Once, I plugged them reversed. The 6 “lower pins“ BMS conector got connected the the higher voltage cells, and the “higher pins“ BMS connector got connected to the lower voltage cells.Big spark and now one of the pins of the battery XT conector is damaged.
That pin in the lowest voltage pin. Am I right to assume that this pin is directly connected to the main negative thick wire ? At least, they show continuity (0 Ohm) between them.
I don’t trust myself to resoldera new XT to the battery … too much amps to close when soldering. Can I simply connect the main battery negative to the damaged wire of the BMS ?
Looking at this wiring diagram, it looks like my plan is OK :
Can we get a picture? You can easily re-pin a connector with something pointy like a knife or needle. As in buy a new plug, swap each pin one at a time, and then just solder the one new one.
Often hobby shops that sell rc stuff and lipos will repair or change connectors for you if you don’t feel confident replacing them yourself. But if you’re up for the challenge post a bunch of pics and we’ll walk you through it
Here is a picture of the connector. It does not look that bad but the plastic has melted enough that I cannot plug the male side anymore.
I think, I’m going to cut the wires (one by one) and solder them to a spare male connector I have (with a lot of heatshrink tubing).
The wires can be removed from the connector body by lifting the little locking plastic tab with the edge of a razor blade, and pulling the wire, on many JST connectors, and it looks like yours allow this.
You can likely get away with soldering only the one wire as the contact is likely fried.
edit: I looked at photo on my desktop zoomed in, and it appears you will have to push the wire forward in the connector and carefully depress the locking tab on the contact itself, before being able to remove the contact from the connector body.
This little metal locking tab on the contact itself might need to be relifted in order to lock inside the new connector body.
For some irrational reason, I’m more scared at fiddling with XT pins than resoldering wires.
But I’ll train on spare parts before touching the live ones !!
Soo … I choose cut the cable and solder them to a new XT connector. I was so scared having to cut live wire that I had to change my shorts twice in the operation !!
When doing balance wires or any connector change - trust no one! Especially yourself. Always check it with a meter to confirm polarity and orientation, regardless of how simple or careful you were. It’s 10 seconds and will save you a ton of headache one time out of 100 but that one time will make it all worth it.
glad you got it sorted