LED Indicators

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I might be wrong but I think LED's will only work with negative ground which your bike is not. As a test, Isolate the circuit and change the polarity.
 
norsa1 said:
I might be wrong but I think LED's will only work with negative ground which your bike is not. As a test, Isolate the circuit and change the polarity.

It depends on the LEDs used and it depends on the socket used. If the standard sockets are kept, then the correct LED must be purchased, they do come in both polarity although the positive ground LEDs are very hard to get (well NOT from the local pep boys outlet or Canadian Tire).

I think he as LEDs with two wires, no connection to the case, he put a small bridge rectifier to feed the led and connected the LED indicator as the original bulb was connected which is on both sides of the switch, that way the indicator would light when the flasher was used on either side.

This is a standard flasher diagram:

LED Indicators


The way *I* wire up a LED indicator is like so:

LED Indicators


With all LEDs, *I* do it like this:

LED Indicators


There are other ways to do it, but this works for me. These diagrams are all for NEGATIVE ground, for a POSITIVE ground system, just reverse all the LEDs and the battery

Jean
 
Putting a full-wave rectifier 'around' the pilot bulb LED (and series resistor) as Mark mentions is an alternative to your wiring of the same Jean and means you don't have to find a ground point.
 
Hi JeanDR - thanks for the diagrams. The LEDs I used are 12v automotive devices. Can you advise what the 10 ohm 20w resistors are for ? - if they are to 'load-up' the flasher unit this may help with my problem ...
 
Jeandr said:
The way *I* wire up a LED indicator is like so:

LED Indicators


Jean

This works in all cases if you replace the resistors with diodes - pointing in the the correct direction for whatever ground polarity you have.
 
You'll still need a resistor to limit LED current though Dave. Downstream of the diode junction (you end up with a classic diode "OR" gate).
 
davamb said:
Putting a full-wave rectifier 'around' the pilot bulb LED (and series resistor) as Mark mentions is an alternative to your wiring of the same Jean and means you don't have to find a ground point.

True, but it gets away from the KISS principle. (don't forget HE has a problem with his indicators, I don't)

Jean
 
mwoo said:
Hi JeanDR - thanks for the diagrams. The LEDs I used are 12v automotive devices. Can you advise what the 10 ohm 20w resistors are for ? - if they are to 'load-up' the flasher unit this may help with my problem ...

Yes, the LEDs draw too little current for the flasher unit I am using, I didn't search for a flasher relay that would work without the load resistor since I am cheap and the flasher relay I bought cost only a couple of dollars and the two resistors are probably a dollar for both (I probably had them in my junk box, can't remember for sure)

Jean
 
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This is what I am using on my current rider with no problems at all.

LED Indicators



I bought the indicator LED and noload flasher from superbrightleds. The 12VDC signal into the switch is from the flasher.

My DR650 has a neat little diode assembly that may be available used cheap. I just grabbed a few diodes that work fine.

edit: I just thought...dont get zenier diodes..just get run of the mill plain ol diodes. If you try Zeniers they might behave funny depending on their rating like passing voltage as the engine speed (voltage) increases.



Here is a vid of the turn indicator in action. The vid is really to show the volt meter/LED; the turn indicator cameo is about half way thru.






If you want to see the signals, this will get you into a bit more detail..
broken link removed


beljum
 
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mwoo said:
Hi JeanDR - ref the LED only flashing for one direction due to polarity 'sensitivity' - I overcame this by fitting a full-wave bridge rectifier to the tell-tale LED thus regardless of the polarity of the current flow the LED always gets the correct polarity ...

FWIW 12 volt "non polarized" or AC/DC LED's that have the bridge rectifier built in are available, they will work as a turn signal indicator, instrument lighting on positive ground bikes, etc...
 
davamb said:
You'll still need a resistor to limit LED current though Dave. Downstream of the diode junction (you end up with a classic diode "OR" gate).

True if the LED doesn't already have one built in. The packaged LED units rated for 12V as would fit the indicator socket don't need an external resistor.
 
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