power surge

Hi
I have just got a skyline gtr r32 1994
I noticed that regularly the battery meter dial shudders
making a funny knock when it happens also lights flicker.
Is this suposed to happen or has i got an electrical fault.
Does anyone know what it is
thanks for any help.
Black streak

Let me put it this way, that is not normal. If your alt is going out, and say your going about 70mph in a bend and alt buys the farm, so does your car. Be very careful, and get that problems solved. If you need an alt, let me know. I can sell you one.

My alt went out, but it was when I was driving in a parking lot, and the car was very hard to control. It screws up the HICAS for some reason.