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LED turn indicator problem

Z

Zac

Just got it firing!
Joined
Jun 2, 2014
Messages
9
Location
Vancouver Island, BC
Hey Folks,

I've replaced my Griso's old "eye stalk" turn signal indicators for sleek and clean LED strips. The indicator bulbs are 12V/10W and the LEDs are rated 12V...now I get turn signal warnings on my instrument panel.

What did I do wrong?

Cheers!

Zac
 
I am not an electrical whiz but my initial thought is you are not drawing enough watts as the LED's probably draw 1 or 2 watts and the warning unit figures the bulb is not working. Not sure if there is a way around it other than a 10W resister inline to the LED. The electrical Gurus on here will know if you can put one in the supply line or one to each unit. On older bikes the lights would flash very fast like a bulb was blown.
 
Zac, Abbienormal is correct. you need to put shunt resistors in so the dash "thinks" you have a bulb fitted. From memory (which should not be trusted) about a 22 Ohm resistor rated at 10 Watts should do the trick. This needs to be placed in circuit across the LED blinkers (in parallel). When this is done, the dash will think it has the correct globe fitted and will be happy.

The only issue then will be if you blow a LED blinker, the dash will not recognise you have a problem.

WARNING - I have never done this so if someone else has, feel free to chime in.

Also see the following site http://www.advrider.com/forums/showthread.php?t=339980 for the calculations they used. Your original wattage is slightly different so the values I calculated should be fine
 
Guys! Thank you so much for the quick replies!

I will try a 22ohm 10w resistor in line with the LEDs, I'm assuming for each indicator?

I have to admit, seeing that error on my brand new Griso almost made my face leak a bit!

Cheers!

Zac
 
Zac, not inline but across the LEDs. Putting them inline will dim the LED to the point where it may not be seen by road users.
 
Well folks, got my resistors in the mail today!

Cue the muffled guffaws...I neglected to check the dimensions of the resistors before I ordered them. They are 3 inches long and almost 1/2 an inch thick. I bought the most expensive resistors I could find because hey...this is a Moto Guzzi we are talking about. Now I have learned my lesson!

I am ordering new and much, much, much smaller resistors and will post again when I have them installed.

Cheers!

Zac
 
The smaller resistors may not not be the 10W resistors that were suggested. Be careful or they may get too hot and burn out or cause damage to their environment.

An alternative might be to use the original bulbs and wire in parallel with the new LED ones. Where to hide them might be another headache.
 
Thanks Kiwi Dave!

Maybe I'll try that, the rear ones will be no problem as they can be hidden under the seat. The front ones though...have to do some thinking on that.

Cheers!

Z
 
Sorry this is going at a snails pace!

I've ordered proper "LED load equalizers" in lieu of trying to source my own resistors. In the mean time though, these are my temporary "packs" to provide the necessary load to trick my Griso's computer into thinking I don't have 4 indicators out.

The connections are soldered (not my cleanest work) and then insulated and weather resisted with electrical tape. It's ugly, but like I said, it's temporary. One for the front two and one for the rear two.

Thanks again for the idea fellas!

Z
 

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