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LED Turn Signals Flashing Too Fast or Not at All?
The flasher is a separate part in your car that makes the turn signals blink. Changing the bulbs does not change the flasher. After switching your turn signal lights to LEDs, you may need to replace that part too.
LEDs use less electricity than the original bulbs. Some older flashers only work properly when the bulbs use enough electricity. With LEDs, the lights may flash too fast, stay on, or stop flashing.
Why Can Changing the Bulbs Change the Flashing?
What Are Your Lights Doing?
Flashing Too Fast
Fast Flashing
If this started after an LED upgrade, your original flasher may not work correctly with LEDs.
Lit But Not Flashing
Stays On
The light can still turn on even if the old flasher cannot make it blink.
Only One Light Stays Dark
One Light Stays Dark
If the other signal lights work, start with the dark light’s bulb, connection, or socket. Replacing the flasher alone may not fix it.
If none of the signal lights come on, check the fuse, power supply, and connections before assuming the LED bulbs are faulty.
Why We Recommend the UFM10
A lower priced LED flasher may work. We recommend the UFM10 because it keeps a steady blinking speed, works without moving parts inside, and comes with help from our team.
The UFM10 works with compatible classic car turn signal and hazard systems that use a separate replaceable flasher.
Fully Electronic
The UFM10 turns the lights on and off electronically. There are no moving switch contacts inside to wear out.
Steady Flash Rate
It keeps a consistent blinking speed with LEDs, traditional bulbs, or a mixture of both.
Silent Operation
It operates without the clicking sound of a mechanical flasher.
5 Year Warranty
Covered by Dapper Lighting’s 5 year warranty against defects in materials and workmanship. Our team can help with installation questions.
Do You Need One Flasher or Two?
Use your vehicle’s service manual or wiring harness instructions to locate the original flasher in your car. It may plug into the fuse panel or a separate connector.
One flasher to replace: Order one UFM10.
Separate turn signal and hazard flashers: Order two UFM10s. Hazard lights flash all four corners together.
You do not need one flasher for each bulb.
For Vehicles With Separate Flashers
Keep the hazard lights connected to their original power source so they can still work with the key off. Some vehicles use a computer instead of a separate replaceable flasher. Those need a solution for that system.
How Does the UFM10 Connect?
The red and white wires connect where the old flasher was plugged in. The black wire needs a separate ground connection, explained below.
Ground means the connection back to the battery’s negative (−) side. The UFM10 is for negative ground vehicles, where that side of the battery is connected to the metal body or frame.
The black wire must connect to an established ground point on that metal. Paint or rust at the connection can prevent it from working.
The colors in this diagram belong to the UFM10. Your car’s wires may be different colors. If you cannot identify which connection supplies power and which goes to the lights, ask us for help before connecting the module.
Do You Need Load Resistors?
Resistors make the lighting system use more electricity and give off heat. On a compatible system with a replaceable flasher, an LED compatible flasher usually corrects the blinking without adding resistors.
Check All the Lights
Test the left turn signal, right turn signal, and hazards. Walk around the car to check the front and rear lights, then repeat with the parking lights on. Also check that the hazards work with the key off.
If the lights still do not work correctly, contact Dapper Lighting with your vehicle’s year, make, and model, which lights you changed, and what happens. A short video of the lights and a photo of the flasher connections can help us identify the problem.