Grounding chasis in the electric vehicle

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what will happen if I ground my 12v(low voltage system) and 144v(high voltage system) to a common ground?
 

Simon Bridge

Science Advisor
Homework Helper
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If it is a genuine ground - then they will both be grounded.
If not then the common "ground" rail acts as a reference voltage for both low and high voltage systems.
A lot will depend on how your car is wired though. You can probably sketch out the resulting circuit diagram.
 

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