Have an Arduino triggering an LED array AND a MOSFET that burns a glow plug for 1 second, from the same power supply (3.7V 720mAh Lipo).
The issue is that when the mosfet is triggered, it seems to ground the circuit and buggers the LEDs and every thing else (grounding?) and no glow from the plug (bcz its basically a resistor to no where?)
Without the other stuff, it burns just fine --> Tried "blink" solo.
Can the circuit be isolated? Diode?