A Griso owner over on the Ghetto noticed that when he installed LED turn signals the lamps were lighting even with the key Off
These bikes don't have a conventional flasher relay, each lamp has a dedicated signal from the Dash
I took this on as a challenge, it was a beautiful sunny day so I ran my GRiSO out into the driveway.
First off I removed one of the rear lamps, its a standard incandescent and measures 1.4 Ohms when cold. When I turned the ignition on without the lamp in place the dash threw up a bad lamp alarm. It does this as soon as the key is On irrespective of where the indicator switch is.
As I suspected there is a very small current pulling the Dash Input/Output (lamp wire) high, this is a common trick with industrial electronics. This current measures just over 40 microamps and its there 24/7 key On or Off. Without the lamp the open circuit Voltage goes to 11.2 Volts.
If the output line goes above 3.2 Volts and the key is On the Dash will trigger the alarm graphic and turn on the red triangle.
I tried a few resistors across the lamp holder to see what effect they have
100K Ohm is too large, the alarm stays On
1K Ohm pulls the open circuit Voltage down to 0.04 and turns the alarm Off, I also tried 2K and that also kept the alarm Off at 0.08 Volts, I settled on 1K.
Note: This is not the same high Wattage low Ohm resistor you need to work with a standard thermal flasher relay, its a tiny 1/4 Watt one
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For the test I converted one side of the bike to LEDs using some lamps I have, these worked fine without shunt resistors, there were no alarms.
The lamps I used are 19 LED clusters with a forward Voltage of 1.97 Volts (obviously all the LEDs are in parallel) so its well below the alarm trigger point of 3 Volts.
Other LEDs may have a different forward Voltage e.g if the LEDs are connected in series. This would mean the forward bias Voltage would be higher, perhaps enough to trigger the bad lamp graphic.
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Conclusion:
I believe any 12 Volt LED will work with the GRiSO dash, you may or may not need a shunt resistor depending on the lamp configuration.
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Recommendation:
If your CARC bike throws up alarms with LEDs solder a 1K 1/4 Watt resistor directly across the lamp holder contacts, this will hold the Voltage down below the alarm trigger point. There is plenty of room in the OEM indicator lamp holder for the small resistor. No need to insulate it as the surrounding parts are plastic.
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Out of curiosity I also checked my V7, it also has dash generated flashing but I suspect the alarm is triggered based on low current as the flash rate changes similar to the old style thermal flasher.