Isn’t it just a gx16 3 pin? 
No.
GX12 3pin? 
The third pin is the NTC, The charger needs to see the resistance within the tolerable range before it will charge. Pretty sure the pinout is labled on the charger, and the GTR battert PCB is labled also for it.
I’ve just spent too long trying to repair a friends GTR ESC. What a waste of time that was.
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The GTR charger just needs to read a 10k thermistor between the purple and black on the charge port and it will charge.
When I had a gtr I put a vesc and new battery and used the stock gtr charger no problemo
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I did just that, and put some of those little three pin amass connectors in the cord - like the ones on the GT motors, so it can be used with different output plugs.
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Is there any way to trick the charger so it reads what it needs to read to send charge?
Yeah, I made a bunch of different adapters for things back in the day I was rolling on 10s and still using GT running gear. I’m not at home right now, but I think I just measured the resistance from the battery and replicated it with a 1/4w resistor.
That charger died in the end, but when I’m home I could have a look at one of the adaptor cables I made and confirm the pin out and resistor value. I used salvaged three pin plugs from old GT motors and ESC’s.
Thank you. Appreciate your help
Alright. My resistor is 8k ohm. I’ll try take a couple photos. I have the faulty GTR charger (started outputting unregulated voltage and I deemed it not worth my time to repair). It has a red, black, and white wire. Black is 0 volt. Red is 42 volt. White is the ntc.
I cut the cable, and used the three pin amas connectors with heat shrink. Obviously, the GTR charge lead doesn’t need a resistor. I made two leads for 1. Evolve GT, and 2. Lime scooter batteries, because I bought 100 of.
The resistor is between black, and white. So negative / 0VDC, and NTC. I had a couple GTR’s, until I gave / leant them to a mate a couple years ago. Spare battery from the wardrobe (I should have sold it) shows it’s 13k at about 12°c, so there’s probably quite the tolerance on what resistor to use.
It’s very wet tonight, thane in the rain!
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So from the charger output, only one wire should have voltage?
There should be 0V, 42V, and the remaining wire is looking for the resistance to 0V.