If you’ve cut open a Dell DC cable (typically for a DIY repair or mod), you’ll likely see these three colors: White Wire (Positive / V+):
Newer Dell USB-C chargers are 3-wire – they use USB PD protocol. 3 Wire Dell Laptop Charger Wire Diagram
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: If you’ve cut open a Dell DC cable
Before soldering, use a multimeter to verify which wire corresponds to which part of the plug. Set your meter to continuity mode; touch one probe to the center pin and find the corresponding wire (usually blue). etc. Safety & Throttling: Before soldering