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

by Lasift Official August 11, 2017

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.

10 Responses

Hugh

October 11, 2024

Recently purchased and installed head light bulbs for a 2014 Chrysler Town & Country. The halogen bulbs were working but the LED bulbs would not work. Not in the low beam or high beam position. I tried reversing the polarity but the bulbs just would not work, no light, no fan, nothing. After this attempt, the halogen bulbs continued to work when reinstalled.

I am very disappointed, as I have a set of LasFit bulbs in my 2013 VW Passat and those all work fine. I am at a loss for why they do not work in the Chrysler.

Brian Henel

March 16, 2024

I can’t get my bulbs to click into place to firmly mount to my headlight housing. Can somebody tell me what orientation it has to be in so I don’t spend all day on 4 bulbs?

Kenneth

February 11, 2024

2021 chevy trailboss.
Bought H11/9005 combo
Easy install but low beams not turning on with day run in park like before. Have to put into drive for them to come on. The hi beams will not stay on. Have to hold switch o. For them to stay on, as soon as I let go they turn off.

Emanuel Contreras

January 22, 2024

I have a 2019 custom trail boss
And I got my low beam and hi beam
LED bulbs the only problem is that they don’t turn on on auto

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.

Glenn

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

Robert

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

Chris

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

Jose

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?