Quote:
Originally Posted by jeff-abalone
I double check with my mechanic tonight...... 100% sure the alternator and battery are working fine.
End up to take off one relay inside the additional relay box.... the volts back to 13.10V at idle.
Don't know what that relay for!!! Totally, no idea...... It doesn't effect any power windows, starting and fuel delivery....I will find it out.... Will keep update
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Updated my result..... 100% sure that relay problem to drain the power.
Drove the car whole day, no problem..... That relay is for pre-heater intake manifold..... now, take it aways... no more power drain and no effect on cold start and seem improved the performance.