i have a 1999 having same prob. need info myself . everything checks out good with ststor even replaced regulator. still having same prob.
A 1997 Pontiac Sunfire would have a voltage regulator and it would be found inside the alternator.
defective voltage regulator
Defective voltage regulator.
If it's like my 1987, and I imagine it is, the alternator is internally regulated, so you won't find a voltage regulator box like you would on some older vehicles. In short, the voltage regulator is in the alternator.
Original equipment would have had an external voltage regulator. Internal regulators came out in the 1973 model year for GM.
Bad voltage regulator
defective voltage regulator
pretty sure its in the alternator
the voltage regulator
Voltage regulator is inside the rear of the alternator Vehicle will start and run until battery either goes dead (open regulator) or burns up (constantly closed regulator) due to overcharging
In a DC circuit, one alternate to the rheostat for controlling battery voltage is a voltage regulator. You could build a linear regulator, but you need to consider the power that might be dissipated - this would be the same amount of power dissipated by the rheostat. You could also build a switching regulator - this would be more complex, but it could be more efficient because the dissipation across the regulator would be less.
Have the alterntor and voltage regulator checked.