When the charger is plugged in, the laptop "queries" the ID chip through the blue wire to determine if the charger is 65W, 90W, 130W, etc. Safety & Throttling:

and will refuse to charge the battery to protect the system.

Dell laptop chargers, like many other laptop chargers, use a specific wiring configuration to ensure safe and efficient power delivery to the laptop. The 3-wire Dell laptop charger wire diagram is a crucial aspect of understanding how these chargers work. In this post, we'll break down the components of a typical 3-wire Dell laptop charger and explain the wire diagram.

Inside the Dell power brick, there is a small "Dallas" One-Wire EEPROM chip (often a DS2501 or

Front View of Plug (Looking into the laptop) [ Center Pin ] ← ID pin (signal) [ Ring ] ← Negative (GND) [ Outer Barrel ] ← Positive (+19.5V)