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Old 01-20-2020, 01:48 PM #16
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Quote:
Originally Posted by Team_Jake View Post
This can always be solved by changing out the turn signal relay with one that’s not load dependent. Any Auto Zone will carry these.
Yeah, I run LED-compatible flashers in both my 3rd-gen 4Runner and 1st-gen Tundra.

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Originally Posted by phattyduck View Post
If you want do do that, connect the ground wire (white-black) from your current corner light to the turn signal positive wire instead of ground. It will flash with the turn signals when the lights are off and opposite the turn signal when the lights are on, like this (ignore the switchback main turn signal, focus on the corner light):

YouTube

I also put in a very bright LED corner bulb to help out with brightness there.

-Charlie
What LED are you using in the corner light? So far the 194 and 921 styles I've tried are polarized. I was originally going to do the "crossfeed" method you've done but didn't want the bumper signals to alternately flash with the corners.

Last edited by Ed_C; 01-20-2020 at 01:51 PM.
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Old 01-20-2020, 01:51 PM #17
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Quote:
Originally Posted by JZiggy View Post
Charlie,

I like this approach. Can you help me understand from a wiring perspective why it works that way?]
Scroll down to "crossfeed method" Daniel Stern Lighting Consultancy and Supply
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Old 01-20-2020, 02:35 PM #18
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Originally Posted by Ed_C View Post
Scroll down to "crossfeed method" Daniel Stern Lighting Consultancy and Supply
The wiring drawing is correct there. I was always under the impression that the turn signal power was grounded when the bulb was off, but 'grounding' through the turn signal filament makes sense. I still have all stock rear incandescent lighting, which would function for that purpose with the LED front lighting.

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Originally Posted by Ed_C View Post
What LED are you using in the corner light? So far the 194 and 921 styles I've tried are polarized. I was originally going to do the "crossfeed" method you've done but didn't want the bumper signals to alternately flash with the corners.
I used stuff from superbrightleds. I found the order in my email history:

The turn signal is an 1157 switchback, PN: 1157-AW60-SA-CAR
(that is what fits in the turn signal used on the Shrockworks bumper, I don't think it will work in the OEM housing)
The corner light is a non-polarity sensitive 194, PN: 194-AHP5

I just chose the brightest non-polarity sensitive 194 compatible bulb they had in amber.

-Charlie
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Old 01-20-2020, 02:52 PM #19
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Quote:
Originally Posted by phattyduck View Post
The wiring drawing is correct there. I was always under the impression that the turn signal power was grounded when the bulb was off, but 'grounding' through the turn signal filament makes sense. I still have all stock rear incandescent lighting, which would function for that purpose with the LED front lighting.

I used stuff from superbrightleds. I found the order in my email history:

The turn signal is an 1157 switchback, PN: 1157-AW60-SA-CAR
(that is what fits in the turn signal used on the Shrockworks bumper, I don't think it will work in the OEM housing)
The corner light is a non-polarity sensitive 194, PN: 194-AHP5

I just chose the brightest non-polarity sensitive 194 compatible bulb they had in amber.

-Charlie
I run those same SBL 194s but in warm white (like incandescent color-wise but much brighter) for my license plate lights, didn't know they weren't polarity-sensitive.
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Old 01-20-2020, 11:07 PM #20
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I think there is a difference between my truck and Sterns wiring diagram. My turn signals do not operate with the parking lights — they are turn signals only. I assume this means they are single filament.

Does this change anything about implementation of the cross feed wiring method?
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Old 01-21-2020, 12:41 AM #21
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Daniel Stern has dual-filament bulbs in the diagram but implementation is the same, just ignore the "parking lamp feed" wiring to the signal bulbs.
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Old 01-21-2020, 11:26 AM #22
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Quote:
Originally Posted by Team_Jake View Post
Yes, that’s what I had in mind. Be sure to use the same resistors / diodes / bulbs I used.

@APhelps , you’re an EE, could you confirm this?
Jziggy wants to keep his turn signal functioning normally and his marker light to function like a dual filament bulb with a dimmer marker light and brighter turn signal light, basically do what I did but splice into the turn signal line rather than cutting it.

edit: see post 23.

Last edited by APhelps; 01-21-2020 at 05:28 PM.
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Old 01-21-2020, 03:48 PM #23
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No reason it shouldn't work but the turn signal bulb should appear dimmer since the current is going to divide by whatever the ohm value is of the marker. (see Kirchoff's Current Law for more info), I suppose one way around that would be to use a bulb that has is brighter with less wattage use (perhaps LED).

Also the marker bulb might blow out due to too much current through it if its not rated high enough (sort of doubt it though).
No, no... bulbs in the car are fed voltage, not current. The turn signal will stay the same brightness even if the corner light is fed the same signal.

Kirchoff's Law only applies to current sources (or when determining the split of current between two loads). In this case, the total current draw will go up by the draw of the corner light bulb - it won't reduce the draw of the turn signal bulb.

-Charlie
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Old 01-21-2020, 05:23 PM #24
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Originally Posted by phattyduck View Post
No, no... bulbs in the car are fed voltage, not current. The turn signal will stay the same brightness even if the corner light is fed the same signal.

Kirchoff's Law only applies to current sources (or when determining the split of current between two loads). In this case, the total current draw will go up by the draw of the corner light bulb - it won't reduce the draw of the turn signal bulb.

-Charlie

Yep I stand corrected. Been a while since I've thought about basic circuits (do mostly programming related non sense these days). Should of drank more coffee this morning and refreshed my brain on circuits before commenting.

Just got to make sure the wire is rated to handle the load (I'd venture to guess it'll be though since Toyota over engineers things).
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Old 01-21-2020, 05:38 PM #25
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Quote:
Originally Posted by JZiggy View Post
Charlie,

I like this approach. Can you help me understand from a wiring perspective why it works that way?

Which LED bulb did you use?
Not sure if you've got your answer but by connecting the ground of the marker light to the positive of the turn signal light, when the turn signal light bulb grounds it is grounding the marker light as well. (i.e. they will flash together)

As far as them flashing opposite of each other, you would need to look at the rest of the circuit.
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Old 01-21-2020, 05:49 PM #26
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Quote:
Originally Posted by phattyduck View Post
If you want do do that, connect the ground wire (white-black) from your current corner light to the turn signal positive wire instead of ground. It will flash with the turn signals when the lights are off and opposite the turn signal when the lights are on, like this (ignore the switchback main turn signal, focus on the corner light):

YouTube

I also put in a very bright LED corner bulb to help out with brightness there.

-Charlie
Just one thing to note about this method, since it sets up a floating ground with the marker light, there can be some feedback issues. Before I setup my turn signals and marker lights with the diodes and resistors, I did this:



When my turn signal was on and marker lights off, some of the interior lights in the center dash console (around the radio and air controls) would flash along with the turn signal (it was faint but noticeable nonetheless).

But you don't mind that then I suggest going this route.
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Old 01-21-2020, 08:08 PM #27
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Quote:
Originally Posted by Team_Jake View Post
Just one thing to note about this method, since it sets up a floating ground with the marker light, there can be some feedback issues. Before I setup my turn signals and marker lights with the diodes and resistors, I did this:



When my turn signal was on and marker lights off, some of the interior lights in the center dash console (around the radio and air controls) would flash along with the turn signal (it was faint but noticeable nonetheless).

But you don't mind that then I suggest going this route.
That would be a good reason to add a diode in the path from the turn wire to the marker ground, right?
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Old 01-21-2020, 08:49 PM #28
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That would be a good reason to add a diode in the path from the turn wire to the marker ground, right?
With the Floating Ground method, current travels through the light bulb one direction with only the marker light on, and travels the other direction with only the turn signal on (and with both on at the same time cancel each other out). Diodes only allow current to travel in one direction, so adding in a diode somewhere in the Floating Ground method does you no good. That's why I did it the way I did.
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Old 01-22-2020, 09:41 AM #29
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Just one thing to note about this method, since it sets up a floating ground with the marker light, there can be some feedback issues. Before I setup my turn signals and marker lights with the diodes and resistors, I did this:

When my turn signal was on and marker lights off, some of the interior lights in the center dash console (around the radio and air controls) would flash along with the turn signal (it was faint but noticeable nonetheless).

But you don't mind that then I suggest going this route.
That's good to know. Thanks for sharing
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Old 02-06-2020, 10:53 PM #30
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Completed this mod and works as advertised. Thanks yall!

Before


Wired in and wrapped up




Wiring
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