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Home » Tech articles » Installing LED indicators turn signals

Home » Tech articles » Installing LED indicators turn signals

Installing LED indicators turn signals

by Tom / Thursday, 22 June 2017 / Published in Bike customization, Electrics, Tech articles
LED lights motorcycles

Installing Purpose Built Moto LED Indicators

This Article will give you step by step instructions on installing your new Purpose Built Moto LED turn signals / indicators.

As every bike is different this will be a general guide only however I will endeavor to explain as much as I can about the “standard” setups I have seen on most bikes I come across.

Tool’s & Materials you need to install your LED indicators:

  • Pliers
  • 13mm Spanner/Wrench or Socket
  • Wire stripper
  • Soldering Iron OR Bullet connectors (male and female)
  • Soldering Wire
  • Heat Shrink OR Electrical tape
  • Load balancing resistors OR replacement LED flasher relay

Hollow tip Black LED indicator turn signal

Step 1.

Remove the old Indicators, take note of the plugs/connectors used to join them into the circuit, I recommend marking the +ve at a minimum. Depending on the set up your bike has, you can either replicate the connectors or possibly cut them off the indicators you have removed and re-use them later.

Step 2.

Install your new Purpose Built Moto LED Indicators. Start by bolting on the light with the M8 Nylock nut and Washer provided. Although M8 is the standard size for most bikes if your model has M10 mounting holes you may need a slightly larger flat washer to make sure they stay mounted as intended. Tighten your LED turn signals down to 15Nm, making sure they’re on the right angle to be visible.

Bright LED indicators Cafe Racer parts Motorcycle accessories

Step 3.

Connect Your LED Turn Signals. Using your +ve marking connect the red wire there and the black to the ground wire. This can be completed by way of either:

  1. Using the connectors removed from your Old Indicators and joining them with a soldering iron and covering with heat shrink or tape.
  2. Using standard Bullet connectors and crimping the wire. This is more common on older model motorbikes

Take care when stripping the cable back as it is far smaller than your standard bulb type indicator wire. LED lights use a lot less power and therefore operate with smaller cables. Double back the wire before you crimp the connectors to give it a bit more purchase. After connecting give the cable a gentle “tug test” to make sure it’s connected properly and plug in.

Step 4.

Making your LED lights flash properly. If you turned the key and hit the switch 80% chance that your LED turn signals would enter a “hyperflash” state. This is because most bikes run on an analogue capacitive timer relay.  In times of old these were analogue timing circuits, with a capacitor. Your indicator flashes on draws 30-46 watts and slowly charges the capacitor, once charged it turns your indicator off and repeats. With new LED lights, they draw 3-6 watts, this charges your capacitor a lot faster. This results in a very quick flash or a flicker in some cases, adding a load balancing resistor slows this back down to a normal pace. Newer flasher relays use MOSFET switching which is a digital solid state unit that is not load dependent and will flash at the same rate regardless of what lights you use.

I explain more about this in my Motorcycle Electrics 101 Blog if you want to learn further, read that. The long and short of it is, if that’s the case you will need to modify or replace it.

  1. Modify: Head down to your local electronics store and buy 4x 5Ω 20 Watt resistors, They shouldn’t cost you more than $0.50-$2 each. Connect these at each light between the +ve and –ve connections. Generally if you search for LED load balancing relays you’ll end up paying way more than you need to, being informed saves you $$$.
  2. Replace: At the same electronics store you can buy a replacement LED flasher relay, these come in 2 or 3 pin depending on your bike. They will cost your around $10-15 and make the job a lot easier and neater.

Cafe racer electrics tray, LED flasher unit solid state switching motorcycle wiring

The Above options will work for all older model motorcycles guaranteed. However on some newer bikes (post 2011) some have all mighty CPU’s that don’t much like modification. Chances are they will work straight away with your new LED headlights (I know Ducati’s do without any modification). If not you can run a new circuit to control the lights with a Purpose Built Moto Black box or similar control unit, which is super simple to install. Failing that ask your local dealer and they should be able to help.

I hope this makes the installation of your new LED Indicators as easy as possible. If you have any questions leave a comment or shoot me an email.

Check out our LED lights here

LED turn signals

For more guides on installing Purpose Built Moto parts, check out our Installation Guides

In our online store, you can also check out our full range of lighting options for your bike.

Thanks for taking the time.

About Tom

My purpose throughout this endeavor has been delivering the build experience to those who otherwise may not have ever had the chance. Taking an inclusive approach with your custom motorcycle project and focusing on making you a part of the experience. In parallel to this I also pour my energy into the manufacture of high quality, detail oriented and above all easy to install components for your motorcycle project.

2 Comments to “ Installing LED indicators turn signals”

  1. Joseph Wilson says :Reply
    January 5, 2021 at 3:58 pm

    Hi guys
    I’ve installed your hollow tip indicators to my XSR900.
    They work fine, only issue is I’ve got one flashing amber and 3 flashing red?!
    Pretty sure they are all wired the same. Any pointers please? Thanks!! Joe

    1. Tom says :Reply
      January 6, 2021 at 8:29 am

      Hey Jo,

      Shoot us an email with a few details and we will try help you out!

      tom@purposebuiltmoto.com

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