Bought this one a couple of weeks ago, PO said they thought it needed a alt, it had a Bosch I swapped in a used Denso. Still same prob. Previously voltage would drop at idle, i would kick up the rpm's and you could kind of hear the car pick up "strength"... odd. The volts would then recover and stay strong.. Swapped in the Denso and had the same symptom,but seemed to get better, now idling is killing the battery, it will lose so much voltage the car will stall due to lack thereof.Have also swapped the RSR, voltage amplifier, cleaned all terminal conn's at the battery... Still sucks, starts at 12v or so and as the car idles to power just keeps dropping on my meter til it stalls out.... Can any one assist with this, any help greatly appreciated...TIA Tom27940aholic