That sounds about right. When the turn signals blink, there is a small
fluctuation in the voltage. However, you ought to have an electrical system
check. Specifically, the battery and the alternator. If some of the rectifiers
of the alternator have blown open, then you see more of this kind of
My idea is that it's normal.
Unless the "dip" is substantial. how much a voltage swing occurs?
Is the battery charged? Are the lights & other electrical accessories
lasting normal length of time? Most gauges are there for
entertainment value and tend not to be exactly accurate.
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