How to wire for led lights

​"Since the wiring is messy, the best way to fix this is to look for clues directly on the Circuit Board (PCB). Here is a step-by-step approach:

​1. Look for PCB Markings:

Most circuit boards have silk-screened labels to help technicians. Look closely at the areas where the wires were originally soldered. You will often find markings like 'LED+' and 'LED-', or simply '+' and '-'. If you see those, you have found your connection points.

​2. Identify the LED Polarity:

LEDs are directional (diodes). If you connect them backward, they won't light up.

• ​The Longer leg of a new LED is usually Positive (+).
• ​On the board, the Flat side of an LED symbol usually represents the Negative (-) or Cathode.

​3. Test the Voltage:

Depending on the type of LED used in toys like this, the voltage supplied at those points is typically between 1.5V and 3V.

• ​Use a Multimeter to measure the voltage at the board's output while the power is on.
• ​If you get a reading in that range, confirm the polarity with your meter and solder your wires accordingly.

​4. Re-soldering:

Once you have confirmed the (+) and (-) points, clean the old solder from the board with some solder wick, and re-attach the wires neatly to avoid short circuits."

​" Wiring Logic:

In most RC cars, LEDs are almost always wired in Parallel, not Series. This is because the battery voltage (usually 3.7V to 6V) is too low to power multiple LEDs in series.

• ​Why this matters: When you are re-wiring, make sure each LED's Positive goes to the common Positive rail and each Negative to the common Ground. Do not chain them one after another (Series), as they will either be very dim or won't light up at all due to the voltage drop."