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2018 Sonata Limited 2.0T (Mfg:11/09/17)
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Discussion Starter · #1 ·
Has anyone thought about using switch-back LED bulbs for their rear turn signal so that they could also be triggered for additional lighting to aid the regular backup LED bulbs? This would give a solid white illumination across both lenses on each side.

I'm not familiar with the type of base used or available but seems like a simple wiring hack to me.

Thoughts?
 

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Not sure about your taillights, but in my '14 sonata, the reverse lights are 921 style bulbs. I got some super bright LED's and don't think I would need anymore. Also, most of the rear bulb sockets for sonata's, while they take a double filament bulb, the sockets have only one pin inside. You would need to put in new sockets and wire over the reverse light to the "white" pin on the switchback. Probably do-able, but I would just stick with the brighter reverse lights if possible.
 

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Switch back bulbs don’t really work like that. I had them on my Trailblazer....basically for your turn signals there will be a power, ground, and signal wire. Switchbacks utilize the power and ground to stay illuminated unless acted upon by the signal wire, thus, causing them to switch colors. What you’d end up with is constant white lights illuminated in the rear signal areas, which I’d assume is illegal in most places.
Cheers!
Ryan
 

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2018 Sonata Limited 2.0T (Mfg:11/09/17)
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Discussion Starter · #4 ·
....basically for your turn signals there will be a power, ground, and signal wire. Switchbacks utilize the power and ground to stay illuminated unless acted upon by the signal wire, thus, causing them to switch colors.
Ryan
OK, thanks. . . need both input and signal for the amber to illuminate.

So, if I use just the power input for the switchback clear LED to illuminate (as B/U lamps), and use an isolation jumper diode from switchback's signal input to the power input, I could get the amber LED to illuminate (as T/S lamps). Wonder if the vehicle's backup circuit is monitored?

Liking the way the 18's turn signals illuminate the side areas around the vehicle, so thinking a clear LED in the rear turn signal lens location would be a bonus illumination when used with the backup LEDs.
 
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