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  #1  
Old 05-19-2017, 06:59 PM
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Mack1946 Mack1946 is offline
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Default Blinkers flash rapidly

While getting my truck painted I replaced the Headlights, tail lights and 3rd break light. They all seem to work great except that the turn signals blink really fast. I assumed a bulb was burned out but not the case. Replaced all four anyway. No change. Replaced the flasher relay. No change. The lights all work so I assumed it wasn't a fuse or open wire.

I took one of the new Headlights off and found that the old lights had two connectors that plugged into the turn signal/parking lights. The new lights fixtures only have a place for one. Now I'm guessing that the empty harness connector is acting like a burned out bulb.

Anyone know if there is anything I can plug into the harness to fix this problem.

Thank in advance.
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Old 05-25-2017, 04:04 AM
usmc1371 usmc1371 is offline
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I've got the same problem with 02 Dakota. at first it was just the right side blinker with the stock headlights and tail lights. but when I put aftermarket lights on it they both blinked really fast. ive tried everything myself. nothing worked so I just ignored it. its got to be something with the wiring harness.
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Old 05-25-2017, 10:55 AM
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You could probably add a resistor like you do when you swap over to LED bulbs.
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Old 05-25-2017, 02:27 PM
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I'll keep you in mind if I come up with a solution.

Steve
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Old 05-25-2017, 02:29 PM
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Jkelly

How would I determine the size of the resistor

Steve
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Old 05-25-2017, 11:38 PM
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Quote:
Originally Posted by Mack1946 View Post
Jkelly

How would I determine the size of the resistor

Steve
Well, you could buy a set advertised for this.

Or, let's do it the hard way.

First we look up what the wattage is of a 3157 bulb. Looking at http://www.bulbs.com/product/3157B2 we get 27 and 8.3 W.

8.3 is the parking/tail light, so we can ignore that.

27W is the turn signal /brake light.

Working backwards, taking 13.5V as the voltage, the current by Ohm's Law is 2 amps ( P=IE, or Power = Voltage * Current - so 27 = 13.5X; 27/13.5 =X; 2=X . Easy peasy math.)

So now we take 13.5, divide by 2 (R = E/I, or Resistance = Voltage / Current); for 13.5/2 we get a nominal resistance of 6.75 ohms.

It'll have to dissipate 27W, so we actually want a 50W resistor (give us about a 50% safety margin).

So, a 6.75 ohm 50W resistor.

Oh, 6.75 is a non-standard value; 6 is close enough, at 13.5V we get 2.25A so 30W. (Note: If you're at 12V, it's 2A, 24W; math is fun!) We still want a 50W resistor to give us some thermal margin.

So.

A 6 ohm resistor across the turn signal side should emulate a 3157 bulb.

If you want to, picking this way, reduce the 27W to (27 - actual_wattage_of_LED_bulb) and work the math; that may mean a 7 ohm or so resistor.

So there you are. Simple math.

Or, just spend the buck$$ and pick up a pair at AutoZone, Advance, Princess, whatever your local / regional / national parts house has in stock.

RwP
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Old 05-26-2017, 01:41 AM
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^^^ I'm not good at the math like Ralph here but it seems like it was a 3 ohm, 50 watt resistor. But this is the reason I did not post a guess up as I'm good at mechanical, not the electrical side.
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Old 06-13-2017, 04:26 PM
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Default The end of the story.

As I said in a previous post, I had new Headlights installed while my truck was being painted. The old headlight assemblies had two bulbs for parking and turn signals. Each bulb had its own wiring harness. The new lights only have one light bulb. When connecting the harness the plug for the second light was just left dangling. The empty plug was like having a burned out bulb.

I bought the 6 ohm 50 watt resistors as recommended by Ralph. Connected the resistor between the blinker wire and the black common wire and it fixed the rapid blinking problem. Because the resistor dissipates 27 watts I screwed it to a metal support to get rid of the heat.

Thanks for the help.

Steve
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Old 06-13-2017, 05:20 PM
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Glad you got it fixed.
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Old 09-04-2017, 01:30 PM
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I had a similar problem, I bought my 2003 Dakota used and then it developed a rapid flash on the drivers side. Went to a scrapyard and changed the blinker module and still no good. Changed all the bulbs - same thing. Poking around under the hood I found what looked like another blinker module connector and it had a closed piece of pvc pipe taped on over the lamp? Took it off and sure enough there was another blinker bulb that had burned out underneath. New lamp fixed it. I suspect the pvc pipe came with the aftermarket headlight kit which only used one turn signal socket per side vs the original two.
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