Your Cart is Empty

The Bulbs Couldn't Light up? One Thing You Must Know before Installing the LED Light Bulbs.

by Lasift Official August 11, 2017

The Bulbs Couldn't Light up? One Thing You Must Know before Installing the LED Light Bulbs.

Last month, our customer Jesus purchased a pair of 9006 bulbs for the low forward lighting on his 1999 Jeep Grand Cherokee Laredo 4.0.

Several days later, he came back and told us the bulbs were perfect condition but didn’t work, he was quite upset as he already paid the mechanic to install them, so he thought the lights were defective and demanded a refund.

We have heard of this issue since we started our business on LED bulbs, the lights are not defective. It is because the positive and negative prongs are opposite to what the car prongs are, all you need to do is reverse the polarity and the bulbs will light up.

This customer followed our instruction to reverse the polarity, and the problem solved, he also left good feedback for us.

So if the same thing happens on your LED bulbs, please reverse the polarity to make the bulbs work.

6 Responses

Tim Schaeffer

July 19, 2023

Bought the 3157-AW60-SA switch backs for my 94 S10 turn signals and they don’t "blink when energized.
One makes the truck indicate the bulb is bad and I’ve switched it out with a new one.


April 19, 2023

I replaced passenger side did not come on. Think bad bulb. Got some new ones. Went to the store looked up at reflection at store it was working. Comment please


March 08, 2023

I bought the switchback t-series for my Chevy Colorado and the amber lights work fine but the daytime running lights aren’t working at all and it’s the opposite when I switch the bulbs 180 degrees


March 04, 2023

Mine were working fine. Then off all of a sudden. Just the fans turns on and no light. $99 pair of fogs light that work for a month and then are defective


February 05, 2023

Mine wont light up , flipped them twice on my 2023 f150

Noah Kingan

October 08, 2022

Hello! I love the product and the community behind lasfit, just installed my first set and the prongs needed flipped to change polarity so reading this made me giggle cuz before I noticed the +- I thought they were ineffective bulbs as well… would love to partner up and possibly help advertise to everyone I know to purchase your bulbs is there any “sponsorship deals” you guys offer?

Leave a comment

Also in Lasfit Blog

How To Install LASFIT Door Sill Protectors On Tesla
How To Install LASFIT Door Sill Protectors On Tesla

by Lasfit Official September 15, 2023

Basically we're protected on the carpet. We have the door sill protector. We also have this kick pad protected now. And pretty much everywhere that you put your feet on is going to be protected by Lasfit. Everything fits perfectly and now the car actually looks newer again. So there are no scratches on our trim anymore. If you had your Tesla for a long time already, and this part is already scratched, you could probably get this door sill protector so that it looks new again. Or if you just got a new car, you could use this to protect it from getting scratched. It's good for both worlds. 

Read More
How to Install LASFIT Second Row Seats Back Cover Mats on Tesla
How to Install LASFIT Second Row Seats Back Cover Mats on Tesla

by Lasfit Official September 14, 2023

One of the main purposes to have these mats is to protect the rear seats of your car. And you know it doesn't matter if you're picking them up soil, or you're picking up plants. You want to make sure that the back of your car is covered. If something does spill onto these rear covers, they're easy to clean. All you have to do is take it out, wipe it or hose it down, and put it back in. They look great. Installation was easy. And it works 100%.
Read More
 Tesla Model Y Floor Mats
How to Install LASFIT Floor Mats on Tesla Model Y

by Lasfit Official September 13, 2023

This trunk mat is pretty cool. I actually like how it looks and actually matches the floor mats. As you can see right here. And now we have full coverage with Lasfit floor liners. The floor mat is doing its job, just fine. It fits really well and looks good overall. Just a great set of floor mats.

Read More