Hello guys i'm using obd connector for my car device so there is two types of pin/gnd which is chessis / and signal ground so just tell me that which pin is best for main power supply to power up my car device.
Just measure resistance between them (guess it is close to 0 Ohm). It looks like both are connected to the same GND
Use the Ground, the chassis may corrode and your connection can go bad.
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