• Sign Up! To view all forums and unlock additional cool features

    Welcome to the #1 Fiesta ST Forum and Fiesta ST community dedicated to Fiesta ST owners and enthusiasts. Register for an account, it's free and it's easy, so don't hesitate to join the Fiesta ST Forum today!

Switchback LED Turn Signals

Messages
92
Likes
69
Location
SF Bay Area
I thought the days of having to wire resisters for LED were gone. I just installed backup LED's and they were plug and play. Am I missing something or are turn signals different?
Turn signals need resistors to trick the flasher relay. Other bulbs light brake lights and reverse lights don’t need them. But now with these new bulbs you don’t even need resistors for the turn signal bulbs.
 


Intuit

2000 Post Club
Messages
2,635
Likes
1,227
Location
South West Ohio
The higher current resistors you add can get rather hot. Curious as to how they're dealing with this. LEDs do not like excessive heat and incorporating a high current resistor with no fan seems like a recipe for early failure.
 


Old Mike Emerson

Member
Premium Account
Messages
206
Likes
207
Location
Uniontown, OH, USA
The higher current resistors you add can get rather hot. Curious as to how they're dealing with this. LEDs do not like excessive heat and incorporating a high current resistor with no fan seems like a recipe for early failure.
Thanks for the info, I hate doing thinks wrong. LOL
 


anticon

Active member
Messages
528
Likes
372
Location
Sherwood
The higher current resistors you add can get rather hot. Curious as to how they're dealing with this. LEDs do not like excessive heat and incorporating a high current resistor with no fan seems like a recipe for early failure.
What exactly do the resistors do? If they just lower the voltage I'm guessing some sort of buck circuit could do that with less heat.
 


Intuit

2000 Post Club
Messages
2,635
Likes
1,227
Location
South West Ohio
@Old Mike Emerson - If they claim to work without adding resistors I would give them a try. Maybe they figured something out. I added resistors to mine but went through the extra trouble of pulling the pins from the harness in order to make the mod 100% reversible. That takes some time.

@anticon - A blown filament in a bulb opens the circuit and of course an open circuit draws no current. Little or no current made the old flasher relays hyper-flash. The LEDs don't draw enough current, resulting with the hyper-flash. I believe the resistors simulate the additional current of the bulb by converting that energy to heat.

@others - BTW we have no flasher relay. This is all handled internally by the ECU... SO BE CAREFUL...
 


anticon

Active member
Messages
528
Likes
372
Location
Sherwood
@Old Mike Emerson - If they claim to work without adding resistors I would give them a try. Maybe they figured something out. I added resistors to mine but went through the extra trouble of pulling the pins from the harness in order to make the mod 100% reversible. That takes some time.

@anticon - A blown filament in a bulb opens the circuit and of course an open circuit draws no current. Little or no current made the old flasher relays hyper-flash. The LEDs don't draw enough current, resulting with the hyper-flash. I believe the resistors simulate the additional current of the bulb by converting that energy to heat.

@others - BTW we have no flasher relay. This is all handled internally by the ECU... SO BE CAREFUL...
That makes sense, thank you for explaining.
 


FocusedSlayer

Member
Premium Account
Messages
482
Likes
473
Location
Crossville, AL, USA
I don't have the switch back turn signals but the rear turn signals that I bought have the built-in resistors are bright, and with no hyperflashing . Best way to check them , leave them hanging outside the housing turn your lights on or blinkers and if the don't light up reverse them . Then double check before you put everything back together. At least that's what I did since I didn't have help and it was just me.
 


Messages
92
Likes
69
Location
SF Bay Area
The higher current resistors you add can get rather hot. Curious as to how they're dealing with this. LEDs do not like excessive heat and incorporating a high current resistor with no fan seems like a recipe for early failure.
This is definitely a concern I've had too. I was assuming the bulbs would probably get hot and worst case scenario I damage my housings and get an excuse to upgrade to projectors. I'll be working around the house this weekend so maybe I'll leave my hazards flashing for a while and keep an eye on the temps with an IR gun.
 


Intuit

2000 Post Club
Messages
2,635
Likes
1,227
Location
South West Ohio
This is definitely a concern I've had too. I was assuming the bulbs would probably get hot and worst case scenario I damage my housings and get an excuse to upgrade to projectors. I'll be working around the house this weekend so maybe I'll leave my hazards flashing for a while and keep an eye on the temps with an IR gun.
Yeah the light bulbs themselves get pretty hot but they're converting a fair amount of energy to light instead of just heat alone. LEDs relatively speaking don't use much wattage but then again I wonder whether their ratings include the high-RPM fans that cool them? Let us know what you find. Sounds interesting.
 




Top