Voltage Questions???

[passat TS]

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I installed a new pair of big Hella 4000's in my rally car (you can see it at
http://forums.audiworld.com/other/msgs/732643.phtml[1] )

I calculated that I'm using around 55-60 amps with everythingthat draws on.
The alternator is a stock one, i.e., 90 amps.

The questions are:

When I turn the auxiliary lights on (400 watts total), the voltimeter gets
down from almost 14V to a little over 12V. Is this OK?

Should I think about upgrading my 90 amp?

TIA,

Carlos.



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===References:===
  1. http://forums.audiworld.com/other/msgs/732643.phtml
  2. http://g.msn.com/8HMUEN/2015