I had my stock AMP gauge refit to be a stock looking Volt gauge last autumn. I was told to just ground it and tap into a 12 volt key on source in the dash to set it up. I did it like that and it does light up the volt gauge but I have noticed that all it seems to be doing is reading dashboard voltage rather than give me an accurate reading on how many volts my alternator is charging my battery with.
For example, then I hit the directional the volt gauge jumps to the left with each click of the blinker. If I have music on loud, the thundering bass makes the volt needle flicker to the left. Hit the headlights, drop of the needle. Hit the hi beams, lower drop of the needle.
By comparison my F150 was stock set up with a volt gauge and it does not behave this way when using any power in the dash. The only difference I can see is the F150 was factory wired to read the charging system, not the dashboard voltage usage.
Is there a better way to maybe run the volt gauge power wire to the alternator stator to just isolate the charging status?
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