Car is a 1990 190E 2.6, 5-speed.
177K miles, unknown if alt is original or not, however, I changed the voltage regulator 6 months ago when it failed causing a dead battery.
Today's symptoms:
battery and ABS idiot lights came on
Voltage at battery with engine on: 13.9V
If I disconnect the negative terminal,
voltage reads ~10V at idle, increases as RPM goes up with peaks to ~16V.
So, does a defective voltage regulator (remember it's only 6 mo. old) make the most sense or is the alternator also suspect?
Thanks!