Retrofit kit burning

I just bought a retrofit kit.
Before I installed it, I turned off the power source and took our the backup battery.
Also made sure the resistance is lower than 5200 ohms.
WhileI’m installing, The wires that connected to the retrofit started burning.
Burning smells and smoke coming out from the retrofit. I had to cut the wires to stop it.
I’m not sure if my retrofit is defected.
I think there is risk of the product catching fire.

Hi @modartis. Would you mind reaching out to our support team regarding the physical damage to your Retrofit Kit? They can take a closer look and properly assess your device. Please give our support team a call at one of the numbers available here. We’re taking additional steps to protect our team and help reduce the spread of COVID-19, so this has resulted in longer than normal wait times. If you are outside of the US, please read our response to COVID-19 here to see how to contact support.