[Mannyfreah1490]

I have a 2002 VTX1800C. I recently replaced all the standard lights with LEDs. The LED headlight, taillight, license plate light, and front turning signals went on without any issues. Once I put 1156 LEDs in the rear turn signal housings, that’s when I ran into problems. Both of the rear turning signals blink simultaneously, no matter if I turn the indicator switch left or right. I did install a $10 LED flasher relay from Amazon thinking it would fix the hyper flash and hazard light blinking sequence in the turning lights. The relay fixed the hyper flash issue, but not the simultaneous blinking in the turn signals. I also noticed that the turn signal indicator in the dash on the fuel tank is very faint and that indicator light is barely visible. I’m thinking maybe I need a stronger resistor relay. Anyone else run into this issue when installing LEDs? Any suggestions or help is much appreciated.

 

[Sempai]

The factory rear turnsig bulbs...are they single or dual filament?


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[Mannyfreah1490]

The factory rear turnsig bulbs...are they single or dual filament?


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The rear turn signal lights are single filament bulbs (size 1156). As in they only turn on when the turn switch is activated. The front turn signal lights are dual filament bulbs (size 1157). The front bulbs have running lights that stay on the entire time you ride and when the turn signal switch is activated they blink brighter to show you’re turning.

 

[Sempai]

On a whim, have u by any chance tried putting the factory flasher back in, just to see it the problem persists?


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[Mannyfreah1490]

On a whim, have u by any chance tried putting the factory flasher back in, just to see it the problem persists?


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Yes, the rear factory turning signal bulbs are in right now and it works perfectly.

 

[Sempai]

Not the bulbs, the flasher unit?


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[DreamBike]

 

[Mannyfreah1490]

Not the bulbs, the flasher unit?


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Not the bulbs, the flasher unit?


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When the original flasher unit is in, not only do both rear turning signals blink simultaneously, they also blink very fast, which is referred to as a hyper flash. I’ve tried taking them out, putting them in, riding with one LED one original bulb, you name it. The goal is to have all LEDs, but I need to figure out this “hazard flashing turn signal” problem 1st.

 

[Sempai]

I’m not familiar with the VTX...How easy is it to access the indicator in the dash? Is it removable? I feel like there may be something awry in that area, it being dim and the one place, other than the switch, where the left and right turnsigs are designed to interact with each other.
Have you thoroughly cleaned the turnsig switch?
Checked the wiring coming from the turnsig switch for any signs of wear/tear/damage?

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[Mannyfreah1490]

No, it can’t be bad wires. When I don’t have all LED in it works perfectly. It’s when I try to put the last 2 LEDs in that it starts bugging out. I currently have the original rear turn signal lights in so it works properly, without malfunctioning while I ride. I just want to be able to have all LEDs in without any glitches.

 

[Vinish]

Search this forum for the possible need to install diodes in these turn signal circuits when switching to LED lights. I am not an expert on this LED conversion but recall having read a number of times of the need for diodes to prevent backflow of electricity through both bulbs when a turn signal is activated.

 

[07Blackcherry]

I have a 2002 VTX1800C. I recently replaced all the standard lights with LEDs. The LED headlight, taillight, license plate light, and front turning signals went on without any issues. Once I put 1156 LEDs in the rear turn signal housings, that’s when I ran into problems. Both of the rear turning signals blink simultaneously, no matter if I turn the indicator switch left or right. I did install a $10 LED flasher relay from Amazon thinking it would fix the hyper flash and hazard light blinking sequence in the turning lights. The relay fixed the hyper flash issue, but not the simultaneous blinking in the turn signals. I also noticed that the turn signal indicator in the dash on the fuel tank is very faint and that indicator light is barely visible. I’m thinking maybe I need a stronger resistor relay. Anyone else run into this issue when installing LEDs? Any suggestions or help is much appreciated.

Read post #13, see if that helps you. The OP has a 2002 `1800C
1800c new owner, looking for info. | Honda VTX Forum (vtxoa.com)

 

[YourNumba1Fan]

I am having the same issue with LED lights. I found that i have Led Lights in the front of the bike and regular bulbs in the back works . I changed the relay and tested 4 sets of led bulbs on my VTX1800c. Bulbs in front 1157 and 1156 in the rear. I gave up after 2 weeks trying.

 

[JPT]

Diode "Fix" for the Honda VTX 1800C | Bareass Choppers Motorcycle Tech Pages

 

[Lukewalter8987]

The bulbs you replaced it with, were they marketed as CANbus error free, no hyperflash, Direct replacement?

 

[Vnseppel]

I have successfully swapped out all turn signals with LED's on a 2003 1800r. No diodes necessary. Used iBrightstar Super Bright LED's from Amazon. LED rated flasher. Can't remember where I sourced it but can look it up if anyone needs it. Pic attached of flasher. I did have a problem with my turn signal switch which I replaced and works perfectly now.

 

[JPT]

I have successfully swapped out all turn signals with LED's on a 2003 1800r. No diodes necessary. Used iBrightstar Super Bright LED's from Amazon. LED rated flasher. Can't remember where I sourced it but can look it up if anyone needs it. Pic attached of flasher. I did have a problem with my turn signal switch which I replaced and works perfectly now.

I don't have an 1800, but it seems like the C models, and maybe only certain year C models have a different setup with their indicators. This assumes that link I posted above to bareasschopers is correct.

 

[DreamBike]

2 choices:
1.use electrical diagram and multi-tester
2. pay somebody who can

 

[Fulkrum]

Late to the party...
The 1800c uses a single blinker display in the "dash". This display bulb bridges the right and left blinker circuits.
When you turn on the right blinker the right side front and rear blinkers blink AND the display in the dash blinks. The same happens when you turn on the left side blinkers.
Now when the display indicator in the dash is lit a small amount of power "bleeds over" from whatever side is activated into the side that is not activated. This is normal.
In a bike with OEM blinkers the small amount of power that bleeds over is not sufficient to light the stock incandescent bulbs on the "off" side.
LED bulbs require substantially less power to activate. The small amount of power that bleeds over from the activated side of the blinkers to the "off" side through the dash indicator IS enough to light the "off side" bulbs.
The end result is when you activate either side of the blinkers all 4 activate.... giving you the 4 way flasher effect.
The fix is a simple addition of a couple diodes into the system. Here the diodes act kind of like one way valves... isolating the two sides of the system from "bleeding over" power from one side to the other.
JPT posted this link earlier:
Diode "Fix" for the Honda VTX 1800C | Bareass Choppers Motorcycle Tech Pages
Which gives a good write up on the diodes you need to get and hop to install them.

Blinkers flashing at a rate faster then stock is a separate issue.
This is caused by the fact that LED bulbs incur much less resistance on the system then the stock incandescent bulbs do.
There are 2 solutions to the issue.
1. Add in resistors to the circuits to fool the system into "feeling" the correct resistance and flashing at the correct stock rate
2. Add an adjustable Blinker flasher relay. These basically have a small computer chip in them to control the timing of the flashing (usually this rate is adjustable).
I would suggest going for solution #2.