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Old 01-26-2006, 10:37 PM
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Front turn signal

I'm rewiring a friend's '41 chev with new wiring harness. He is using LED tail light's so We are using LED flasher's for turn and hazard the front park light's are not LED we cannot get the front turn signal's to work.?? any idea's. I don't know if it's because of the LED Flasher?? Any idea's would help we are at the hair pulling stage.

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Old 01-27-2006, 03:46 AM
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Doc here,

I a bit confused here,

Are you saying you have LED Brake/Turns in the rear, and incandescent in the front, But the rears flash and the fronts don't?

Is that correct? and do the fronts just light but not flash in that direction? or not light at all?

You are using a Solid State flasher unit for the LED 's right?

If I understand it right, what it may be, is the solid state flasher may not have enough drive to power up the incandescents and therefore they don't come on..

You may have to go the other way with it, A Standard 556 Flasher, with resistive loads on the LEDS to run the whole system.

The difference is a few milliamp on the LEDS to a few amps on the bulbs..Check on your flasher unit for max draw at the output, I'll bet you don't have enough to run the bulbs.

Doc
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Old 01-27-2006, 11:52 AM
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Thanks Doc I will try the load resister.
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Old 01-27-2006, 02:36 PM
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Quote:
Originally Posted by ORHotrod
I'm rewiring a friend's '41 chev with new wiring harness. He is using LED tail light's so We are using LED flasher's for turn and hazard the front park light's are not LED we cannot get the front turn signal's to work.?? any idea's. I don't know if it's because of the LED Flasher?? Any idea's would help we are at the hair pulling stage.
I ran into that problem and went crazy for a while, then I went and got a set of LED's that I could use the standard flasher with, I picked them up at a swap meet . I went the flasher route before
I got the better LED's, it drove me crazy . I think I got them from vendor from www.chevychevy.com
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Old 01-27-2006, 05:24 PM
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front turn signals

Haven't experienced this myself but I understand that LED lights won't flash on their own with a regular T/S flasher. You've got two regular bulbs in the front that might be enough to make the combination of 2 regular and 2 LED lights flash. Have you tried a regular flasher or a 4-way flasher to see if that will work? Is there a resistor or something that can be added to each circuit for the LED bulbs to put enough load on the regular flasher to make that work? Just guessing out loud...
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Old 01-27-2006, 06:04 PM
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Quote:
Originally Posted by OldGMtech
Haven't experienced this myself but I understand that LED lights won't flash on their own with a regular T/S flasher. You've got two regular bulbs in the front that might be enough to make the combination of 2 regular and 2 LED lights flash. Have you tried a regular flasher or a 4-way flasher to see if that will work? Is there a resistor or something that can be added to each circuit for the LED bulbs to put enough load on the regular flasher to make that work? Just guessing out loud...
Doc here,

Good Guess!

Basically, that's the way you want to do it...

The Current draw of the Incandescent Bulbs USUALLY is more than the Solid state Flasher can handle, That, and the marker indicators on the instrument cluster..Those LED's only Draw Milliamps, as opposed to the bulbs that draw AMPS..

If your mixing systems, you need to cater to the highest Draw (Bulbs) and modify the lowest Draw to conform..In this case, The Resistive load placed in series with the LED's , and a Standard 556 Flasher to drive them.

This manner will provide enough current to drive the system, whereas , the Solid State Flasher will just saturate.

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Old 01-27-2006, 06:24 PM
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I have the same arrangement-- The LED tail lights and incandescent front lights.
The LED flasher I used is a TMI-LED brand Model #98. I works great. No resistors. It will flash when the load is 20ma (.020 amps) or more and will handle up to 20 amps.
The load is actually switched by an integral relay.
It plugs into the standard flasher socket.
It can be used for turn signals and 4 ways.

You may have a flasher that is LED only but I would be surprised.

Eliminate other possible causes.

Have you tested the front turn signal lamps, sockets and grounds?
This is easy to do. Disconnect the connector at the steering column. Then connect a temporary jumper wire from the POS battery terminal to the wire(s) running to the turn signal bulbs(s). The GM color & size of the wires are; DARK BLUE #18 for the right front and LIGHT BLUE #18 for the left front.

Check the connector at the steering column. Are the wires (DK blue & LT blue) making contact with the correct wires coming from the turn signal switch?

The turn signal switch could be defective.

vicrod
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Old 01-27-2006, 07:16 PM
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The problem is that the LEDs don't draw enough current to run the electro-mechanical flasher. Same thing often happens in an old conventional incandescent light system when one of the turn light bulbs burns out, flasher won't flash.

Those old flashers run all the turn signal current thru a heating coil that is wrapped around a bi-metallic strip. As the current flows, the heater heats the strip. The two dissimilar metals in the strip expand at different rates and the strip bends in an arch. This is great because at the end of the strip is a set of contacts that breaks the circuit to the heating coil (and thus the lights), so the lights flash and the strip cools down. When it cools it closes the electrical contacts and the lights come on. This cycle happens fairly quickly thus blinking the lights. The more incandescent lights you have on a flasher, the faster they blink. The fewer lights the slower they blink. Replace the lights w/ low current LEDs and the flasher thinks you have a bunch of burned out bulbs and won't go!

Solid state flasher work OK but they are a little $$. Try putting a 0.1ohm, 5W resistor in series with the old style blinker and it should work fine.
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Old 01-27-2006, 08:06 PM
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Thank's to all for posting on my problem. Haven't had time yet to try any of the idea's but will let you all know here when I get the problem worked out. I will try Doc's 1st.
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Old 01-29-2006, 02:29 PM
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Quote:
Originally Posted by ORHotrod
Thank's to all for posting on my problem. Haven't had time yet to try any of the idea's but will let you all know here when I get the problem worked out. I will try Doc's 1st.
Doc here,

ORHOTROD ,

Doc here,

Sorry about that, Endorphin Misfire...

The Info I gave you on the Flasher is in error..The Correct Flasher PN is 552, not 556,

The 556 is a Duel Linear IC Timer, It too can be used for Setting up a timebase for small draw items That require a Timed On/Off pulse, Or For Frequency generation...As well as it's sister, the 555 timer, single Linear Op Amp timer.

When you get to be my age, your lucky if you can remember your address some days!

Sorry If I put you through some "Trials " trying to find this one..


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Old 02-06-2006, 01:06 PM
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turn signal

The front signal's work now thank's Docvette . LED rear incandesant front the load resistor was the answer. Thank's again.
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Old 02-06-2006, 03:20 PM
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Doc here,

Good Job!

Thanks for posting back with the fix..May help out the next guy along the way!

Glad to hear your on the Road again!

Doc
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Old 10-16-2008, 10:14 AM
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83' chevy turn signals

I'm rewiring the turn signals on my 83' chevy 3/4 ton 4x4. Instead of using the original I decided to go around the fuse panel and use a Model 900 blinker system. The only thing is it says to wire it up to the flasher, then to a fuse, and finally to the heat.

Here's my question. Is it possible to go around the panel and still wire the system to the flasher?
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