1. Remove the original power switch tube or thick module, and securely fix the module onto the original radiator; 2. Check whether the anti-peak absorption circuit is normal and whether the secondary load of the transformer is short-circuited. 3. Connect the red wire of the module to the C-pole solder joint of the original power switch transistor (the D-pole for field-effect transistors, and the C-pole for thick-film or internal power transistors); 4. Connect the black wire to the hot grounding section (the negative terminal of the high-power filter capacitor); 5. Connect the yellow wire to the negative terminal of the secondary rectifier diode of the transformer and to the positive terminal of the main power supply (12V or 24V) filter capacitor (main power supply). Color: As Shown Material: POB+Electronic Components Package Contents: 5PCS DC12/24V 46 inch Step Down Buck Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.