Voltage regulator and idiot light question

Louis-Alain Richard larichard at plguide.com
Wed Nov 19 10:12:51 PST 2008

Hi there,


My car, an 1983 urQuattro with a Bosch 90A alternator and a battery under
the rear seat, had a voltage regulator problem last week. The problem (+16V)
made the battery boil and lose half of its water, and made the driver a bit
dizzy. More, when the driver stopped, the car wouldn't restart, no more
juice at all. But, the problem was not the dead battery : I've installed a
SPARCO safety electrical cut-off switch between the front seats, and it
looks that it melted internally, preventing current flow. 


But why the ALT idiot light never lit ? 


Isn't it suppose to show any problem, no charge or overcharge ? I've
installed a voltmeter, but to keep the dashboard stock looking, it is in the
glovebox with the air-fuel ratio meter and the diff lock rotary switch. The
3-hole center panel is filled with oil and water temp, and oil pressure. I
was sure these meters were more important than voltmeter, but I may
reconsider my choice now.



1983 Quattro with a new battery, new voltage regulator, new switch and a
funny smell in the cabin.


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