Instructables

Festoon Bulb Adapter

In this instructable, I will show you how I made an adapter to allow me to upgrade my Toyota Corolla interior dome light. The smallest festoon LED i could find (on the high-street) was 36mm however my Toyota's festoon bulb was only 31mm. I thought it would jam in but unfortunately it was just too tight. 


 
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Step 1: Tools & Materials

Picture of Tools & Materials
Materials

UK Plug with serviceable fuse
Old AC power cable (or an old HB pencil)
Wire
Previous festoon bulb (or tin foil)
Insulation tape


Tools

Soldering Iron
Stanley Blade
Dremel
Wire Strippers
Soldering work clamp (or in my case a pair of mole grips)


Step 3: Build Spacer

Picture of Build Spacer
IMG_1072.JPG
The spacer is going to be the bit that sits in place of the incandescent bulb.

I used a section of insulated power cable, but you could use a all piece of pencil. Cut it slightly shorter than the full length of the old bulb. I then wrapped the ends with insulation tape to make sure the core wires couldn't make any electrical contact.

I then removed the contact caps from the old bulb and simply pushed them on to each end of the spacer, you could use a crimper to make them more secure but be careful not to warp them too much.


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