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Old 05-16-2021, 07:50 PM   #1
Pilotdave
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Default LED Tail Lights - Adding Resistors

After installing Signal Stat 900 turn signals a few years ago, I recently converted the tail lights to LED units. The flasher is the old style bimetal type, and the flash rate is quite high. Today I tried to add a 25 watt, 6.5 ohm resistor in parallel to the flasher circuit wiring near the tail lights: one lead attached to the turn signal/brake wire, the other attached to ground. This made zero difference in the flash rate, and I'm hoping to find some hints that will correct this. Any and all ideas are welcome!

Thanks much.
Dave
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Old 05-16-2021, 08:08 PM   #2
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Default Re: LED Tail Lights - Adding Resistors

While I've never heard of a Signal Stat 900 (what ever that is!), the usual fix for this is you get yourself an electronic flasher unit. They are made for LED lights and their low energy consumption.
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Old 05-16-2021, 08:19 PM   #3
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Default Re: LED Tail Lights - Adding Resistors

The Signal Stat 900 is a US-made turn signal brand. Synder's catalog pictures it (or one just like it) on page A-170 of their 2021 catalog.

Thanks for the suggestion. I've tried the electronic flasher units with no luck - I've read on here that they're very sensitive to electronic noise from the engine, though there may be a way to shield them.

I'm hoping to get some ideas about what I did wrong installing the resistor - according to the videos online I've done it correctly.......and it's a very simple concept that logic says should do the trick!

Thanks.
Dave
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Old 05-16-2021, 08:32 PM   #4
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Default Re: LED Tail Lights - Adding Resistors

https://www.snydersantiqueauto.com/P...earchByKeyword


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Old 05-16-2021, 08:42 PM   #5
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Default Re: LED Tail Lights - Adding Resistors

Thanks for the link, shew01. The resistors I have are similar, though lower wattage and slightly higher resistance.

I think I've installed the resistors correctly - if anyone has done this and could comment on how I installed them, it'd be a real help.

Thanks!
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Old 05-16-2021, 08:53 PM   #6
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Default Re: LED Tail Lights - Adding Resistors

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My turn signals are front cowl lights with the O.E. type bulbs, rear are tail lights with
L.E.D. lights. I have a 6 volt system and use a standard 6V flasher unit. My flashers,
right turn, left turn, and emergency flashers works perfectly. My flasher controller system
is made by "EVERLASTING".
John
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Old 05-16-2021, 10:27 PM   #7
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Default Re: LED Tail Lights - Adding Resistors

Dave, I've done the same as you with a 12V neg ground conversion. I'm using a 50W, 6 ohm resistor at each LED tail light. The results are acceptable and what I would call "normal". Same Signal Stat system. Sound like mine are wired just as you describe --- one end to the turn signal wire and the other end to ground. Maybe add a little resistance -- 6.5 ohms isn't much.

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Old 05-17-2021, 12:30 AM   #8
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Default Re: LED Tail Lights - Adding Resistors

Dave, you didn't say if you were 6 or 12 volt. I am running 12 volts and found this flasher that works for me perfectly with a Signal Stat 900.
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Old 05-17-2021, 04:59 AM   #9
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Default Re: LED Tail Lights - Adding Resistors

Tom Wesenberg has posted on this, I think. See if there is an answer here:

https://www.fordbarn.com/forum/searc...rchid=22793566
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Old 05-17-2021, 05:33 AM   #10
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Default Re: LED Tail Lights - Adding Resistors

If you are still using incandescent front lights for the turns, then just replace them with higher candle power bulbs. They'll be available locally or from the vendors. When the 3 cp are replaced with 10cp bulbs there is enough resistance to fire the thermal 535 flasher. I use the cowls and parks as front turns.

I've tried the resisters and electronic flashers too, thats why I just change bulbs.

However since I've played with this there is supposed to be a flasher that will work on 6v, but, I haven't tried it.
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Old 05-17-2021, 06:39 AM   #11
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Default Re: LED Tail Lights - Adding Resistors

Thanks very much for all the suggestions. The car is 6v, + ground. The front flashers are the amber lights that mount between the bumper bars. I'll check their wattage and/or see if there's a higher wattage version of the bulb for them.

The 6.5 ohm resistors installed in parallel is intended to lower the resistance of the circuit, thereby increasing the current flow enough to make the flasher unit happy. Thus far the results are defying Ohm's Law!
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Old 05-17-2021, 07:38 AM   #12
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Default Re: LED Tail Lights - Adding Resistors

Pilot Dave,

Check the ground connection using an ohm meter. I chased a problem with my resistors until I found that what I assumed was a good ground point was not. If that does not work, try a resistor with a lower resistance. You can buy these online that are used for modern cars that are converted to LED's.

The flasher modules made for LED's sometimes have a different pinout. Check the letters on the module to see if the pins are in different places. You can wire up an adapter to change the pinout or rewire the socket. Try the adapter first to make sure the LED flasher will work with your car. Also, check the wattage or amperage of the LED flasher module to see if it will handle the current of your turn indicators.
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Old 05-17-2021, 07:57 AM   #13
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Default Re: LED Tail Lights - Adding Resistors

Your resistors are the right size, I suspect bad ground to the battery. (The return current has to go all the way.)
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Old 05-17-2021, 09:55 AM   #14
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Default Re: LED Tail Lights - Adding Resistors

Quote:
Originally Posted by CarlG View Post
Dave, you didn't say if you were 6 or 12 volt. I am running 12 volts and found this flasher that works for me perfectly with a Signal Stat 900.
That is the same flasher I use in my "self wired" hidden system. I hate the look of the add-on turn signal switch.
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Old 05-17-2021, 10:48 AM   #15
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Default Re: LED Tail Lights - Adding Resistors

I have a 6 volt positive ground system with LED directional lights and I've been using this electronic flasher for a couple of years with no problems.
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Old 05-17-2021, 12:32 PM   #16
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Default Re: LED Tail Lights - Adding Resistors

I believe that the resistors are only needed if the flasher flashes too SLOW. The resistor increases the current that goes through the bi-metal switch which results in it heating up faster increasing the flash rate.


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Old 05-17-2021, 05:50 PM   #17
Patrick L.
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Default Re: LED Tail Lights - Adding Resistors

I didn't know you were using the bumper bar lites. I thought you were trying to use the original lights. I think the bumper lites are LED and would then probably need an electronic flasher.
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Old 05-17-2021, 07:08 PM   #18
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Default Re: LED Tail Lights - Adding Resistors

I was able to find 6v bulbs for the trailer marker lites I have on my bumper.
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Old 05-17-2021, 07:13 PM   #19
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Default Re: LED Tail Lights - Adding Resistors

Bob, the resistors are meant to cure hyperflashing. I know it does not sound logical but that is what they are for. See https://www.superbrightleds.com/blog...rflashing/275/.
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Old 05-17-2021, 08:21 PM   #20
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Default Re: LED Tail Lights - Adding Resistors

Quote:
Originally Posted by Pilotdave View Post
After installing Signal Stat 900 turn signals a few years ago, I recently converted the tail lights to LED units. The flasher is the old style bimetal type, and the flash rate is quite high. Today I tried to add a 25 watt, 6.5 ohm resistor in parallel to the flasher circuit wiring near the tail lights: one lead attached to the turn signal/brake wire, the other attached to ground. This made zero difference in the flash rate, and I'm hoping to find some hints that will correct this. Any and all ideas are welcome!

Thanks much.
Dave
What has changing the tail lights got to do with the turn indicators?
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