Start Assist LED "on"

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David Armytage about a year ago

Hi, I have set up the start assist between my crank battery and my aux. battery. However, once my crank battery switches the isolator over to the aux battery my led 12V (no resistor, as per Redarc diagram) glows, but, when I press the push button switch, the LED glows even brighter (not like me). Can it be the switch that is allowing the LED to glow (the switch is alleged 12V).

Any assistance would be great.
Cheers
Dave

Dylan @ REDARC

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Hi Dave,

Please see the diagram here. This diagram is the same as the one that comes with the product. Note that it says 'Resistor required if push button installed'.

In your case though, you would not need another resistor because you are using a 12V LED. What you are seeing is expected, when you push the emergency override button you are getting 12V directly to your 12V LED, which then passes through the resistor in the LED setup, then the LED itself to ground. When the external LED is activated via the controller (not the emergency button) the 12V passes through an internal resistor in the controller, and then through the LED circuit as described above.

So essentially when the External LED is activated by the controller, the 12V must pass through 2 x resistors, where as when the emergency button is pushed it only passes through 1 x resistor. This is why the LED glows brighter when activated by the emergency button.