I am going to find a way to add a capacitor to the dimmer circuit to reduce the voltage spikes when starting the car. Short term solution is to turn off the headlights when starting the car.
What about a simple Voltage regulator like this ?
7812 +12V Voltage Regulator TO-220
That part may not handle the load - but something similar may work.
Any idea how much current is running through the dash lighting circuit ?
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