I just replaced a 3057 tail light bulb. I considered a 3157 since it has red LED’s, last longer, and looks really bright. Here are the issues. The 3057 filament bulb has two different filaments. The outer filament I measured at 800 ohms, the inner fatter, shorter filament I measured at 400 ohms.…

The bulb are reversable and the circuit remains the same. the bulbs,3057, 3157, 3457, are interchangeable as well, the difference being the brightness. When you mention LEDs…THAT changes things and we can only hope you don’t melt anything. I have not heard of meling LED 3157 but those silly blue …

Here’s a great site for more bulb information than you’ll ever need: http://www.donsbulbs.com/cgi-bin/r/t.pl

I used the LED 3157 once, did not like them. The biggest issue I found is that the tail lights are quite bright, so bright that it was hard to tell when the brake lights were on. There was only a very small difference between the brightness of the two. Note: these were the LEDs commonly sold at p…

Oh, so they (3057 bulbs) can go in either direction? I wondered why there was no key to index the direction?

I doubt that Ken will see your post as he has not posted here since 2017.

[image] mrbreezeet1: Ok, I didn’t see the year. You’re not alone. It’s easy to look at the “Jan '15” date and think it was Jan 15th. Many of us make that mistake.

Yeah, I thought it was this year. So I guess those bulbs can go in either direction?

Oh…ok…I got you, January of 2015…

If you put them in wrong won’t the tail lights be brighter than the brake lights?

How to replace a 3057 bulb, 3057 vs 3157

Maintenance/Repairs

NYBo January 17, 2021, 3:30pm 12

No. There is no “wrong way”. Notice how the contacts are offset? The same applies if you rotate the bulb 180 degrees, keeping the proper filament connected to the proper circuit.

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How to replace a 3057 bulb, 3057 vs 3157

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