You can buy these strips of 3 LEDs but they cost over £8 a pack for 2 I already had a strip of 30 LEDs which I bought on EBay for about £1.50 so I figured I would just make my own
Step 1: What You Need
A 12v SMD LED Strip, mine is a stripe of 30
Electrical wire, I just used what I had to hand which was 10amp
A soldering iron and Solder
if you have one a helping hand soldering tool to hold the wire and LEDs in place while your soldering
a hot glue gun
Step 2: Cut and Strip and Prep
We need to cut a length of LEDs that will fit in the handle of the car, 3 is enough and is what is on commercial packs but you need to cut well back from the first LED to allow you enough space to strip it back and solder the wires on. About 1.5CM should be enough.
Once you have cut it you need to strip off the double sided tape from the back.
Then using your soldering iron apply heat to the back for the strip where you’re going to attach the wires this will lift the water proof gel that covers the back strip, once heated just peel it back and cut off the gel.
Now you can reveal the contacts by scratching off the black covering on each side of the strip on the LED side of the strip.
Step 3: Attaching the Wires
If you have a 9v battery and some test wires you can clip them on to the battery and on to the contacts to work out which side is positive and which is negative once you have this you can solder the correct colour on to the correct side.
Remember LEDs will only work with the correct polarity e.g. with positive and negative on the correct contacts.
Step 4: Water Proofing
Apply a generous amount over the contacts to sure water proofing.
Step 5: Finishing Off
I haven’t attached mine yet but as soon as I have I will put the pictures up for you.