Q: May car is not starting after shutting it off

asked by on

After driving the car for a while then i shut it down and when try to start it again after a while its not starting and it's showing less than 12v for battery

I changed the battery but still having the same problem

My car is holden hsv
My car has a manual transmission.

Pontiac
G8
hard start
2008
V8-6.0L
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