Alternator is taking a while to kick in

[passat TS]

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Lately, every time I start my 2.2l CGT, the voltmeter shows either 12V or one
led lower for an unreasonable long time, then jumps to the normal 14.5V.

I noticed that when I rev(4k+ rpm) the engine for a while it goes back to the
14.V.

I have my panel rewired (I have a custom panel), and about 2 weeks ago the D+
wire got a bad connection and the alternator wasn't working until I fixed the
D+.

Is this any sign of an alternator/regulator about to give me some trouble?

After the initial period it does work fine. I drove a little over 4 hours
yesterday with no problem, just the scare first 5 minutes when the voltmeter
didn't go to 14.5V.

I have an almots new Optima Deep Cycle (yellow), so I don't think it is the
battery.

TIA,

Carlos.

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