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02-03 Hotbodies Undertail Light Upgrade

Old 07-10-2011, 06:47 PM
Thread Starter
Join Date: Jun 2010
Posts: 92
Default 02-03 Hotbodies Undertail Light Retrofit

After seeing 2 F4is in the area with the crappy stock lights I decided to share how i upgraded my lights.

I bought the 1.85 Round LED boards at
Welcome to CustomLED.com - the home of cutting edge motorcycle LED products.

and also got two of these:
Custom LED Magic Blinker Relay - Convert 2 wire LED blinker to 3 wire

To make them work you have to pop out the stock lights and remove the lens from the backing. Some suggest heat, some suggest dremel. I used a dremel and wished i would have used heat.

The 1.85" boards fit in the lens perfectly without the backing. Just use some silicon in the edge of the board and coat the entire back of the board to protect the solders.

Make sure when you put them in you line them both up. Otherwise they may be clocked differently. It would look terrible.

Once the get them back together silicon them back into the undertail and wire them up. They are way brighter.

I also bought this to slow down the blink rate:
Custom LED Electronic LED Flasher Blinker Relay - Plug And Play

Onto the media

Here is two pics comparing the boards. As you can see the custom LED one has way more LEDs

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and a vid of the final product

Last edited by gint; 07-11-2011 at 09:00 AM.
Old 07-11-2011, 12:28 AM
Junior Member
Join Date: Jul 2011
Posts: 10

thanks man. been wanting to do this
Old 07-11-2011, 03:29 PM
mutantblack's Avatar
Junior Member
Join Date: Feb 2011
Posts: 24

I really need to do this. My stock one has some LEDs burnt out. Thx op.
Old 08-10-2011, 05:11 PM
Junior Member
Join Date: Jul 2011
Posts: 1

Hey I know this is a little older post but my 03 f4i has a hotbodies undertail. Lights are junk as usual need to replace. I've been looking at customled.com and was curious if they can be set up like the hotbodies lights where you have the integrated signals in as well. Because I want to set up running/brake lights and signals all in one using the custom led lights. If possible what do i need to make the integrated turn signals also. Any help would be great thanks.
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