Please help to identify this problem

[me2kimi]

Hi guys, it an intermittent problem happened to my car. The battery gauge drop when rpm is around 700-800.
But it will increase when i press throttle a bit especially when headlight turn on.
Is it alternator giving a signal to kong?


Battery fluctuate - YouTube

 

[feipepe]

did u check all grounding cable lay around car chassis body? it look like ur grounding earth issue. because i had facing b4. after DIY changes to more big size cable, the problem solved. this is only my 2 cents knowledge.

 

[me2kimi]

I already use 7 point grounding cable. So grounding should be no issue