I am putting grip heaters on my motorbike, and want to add an led indicator to show if they are on high or low or off.
The heaters have a resistance of 7.5 ohms each, running at 12 volts DC from the bikes charging system/battery. I will wire it into an on-off-on DPDT rocker switch so that on low the heaters are connected in series, and on high in parallel. Simple enough.
What I can't work out is how to wire leds into the circuit to show the high/low state. Ideally I'd like a single tricolour led (eg red for high, green for low) but if it's much simpler using two leds then so be it.
It seems I can't wire the leds in series with the heaters as the necessary resistors will limit the current and therefore the heat produced, which defeats the purpose.
Is there a simple way to do this? Keeping in mind that it will be on a bike and exposed to moisture and vibration, so ideally any components could be potted into epoxy or something.
The heaters have a resistance of 7.5 ohms each, running at 12 volts DC from the bikes charging system/battery. I will wire it into an on-off-on DPDT rocker switch so that on low the heaters are connected in series, and on high in parallel. Simple enough.
What I can't work out is how to wire leds into the circuit to show the high/low state. Ideally I'd like a single tricolour led (eg red for high, green for low) but if it's much simpler using two leds then so be it.
It seems I can't wire the leds in series with the heaters as the necessary resistors will limit the current and therefore the heat produced, which defeats the purpose.
Is there a simple way to do this? Keeping in mind that it will be on a bike and exposed to moisture and vibration, so ideally any components could be potted into epoxy or something.