Damn alarm killed the battery... again.

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viper84737 said:
There is no transformer in a DC-DC appliance like that. No voltage regulator, either. Just a simple resistor to turn 12 V into 5 V and a 5 V LED.

Edit: Actually, there sometimes can be circuitry that does regulate it to 5 V, but it's generally found in more complex circuits. Either way, that draws less current than the 5 V light itself, but sure, to be fair, the sum of the current draw was responsible, as the light was on the whole time.
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lol :) I had a similar setup on my 08 R6. Thought it was the LED as well that was killing my battery. My 12v to 5v USB adapter WAS regulated.

I measured the total current draw of the 12v to 5v USB adapter with my battery at 12.8v and nothing plugged into the USB: 48ma
I cut the lead to the LED so it didn't light up anymore, total current draw: 36ma
Therefor LED current draw: 12ma

I corrected the problem by putting the 12v to 5v USB adapter on a switch. When the switch was "off" the USB port would only be powered when the bike was running (license plate light lead), with the switch "on" it would be powered 24/7 (for charging my phone when the bike was off).

Other 12v to 5v USB adapters might more efficient.

-Jamie M.
 
toysareforboys said:
I corrected the problem by putting the 12v to 5v USB adapter on a switch. When the switch was "off" the USB port would only be powered when the bike was running (license plate light lead), with the switch "on" it would be powered 24/7 (for charging my phone when the bike was off).
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An excellent solution.
 
toysareforboys said:
11.5v with the key on signifies a bad battery (assuming your headlights don't come on when the key is on). Should never drop below 12 with they key on (no headlights).

-Jamie M.
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The headlight DOES come on when the ignition is on.
 
coyo said:
The headlight DOES come on when the ignition is on.
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Your bike sucks ;)

My voltage drop guide is for my bike, where the headlights do not come on until the bike is started. Not sure what your key on voltage drop should be when running your headlights too.

Maybe try holding the starter button down half way so your headlights don't come on and check the voltage again.

-Jamie M.
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