I'm not quite sure what to think of this yet. My voltage gage is bouncing about like crazy the last few days & wasent sure if its a sign that the voltage regulator is going or what. Normaly it reads 14.7 but now it will bounce between 14.5 to 14.8 constantley & every few minutes go up as high as 15.4 & down to 13.0. I need to test it with my multi meter but havent had the chance yet. But Ive never had such an erratic reading from any car Ive owned before. Normaly if the alt goes bad it just goes. I thought mabey the battery was going but it reads a solid 12 1/2 volts on the meter.
Im hoping it just a fluke cause I just got done dumping about 300bucks in replacing the crank sensor, oil presser sensor, & intake gaskets along with new oil & fluid every where. What really sucks is I just changed the oil about three weeks ago & had to do it again because of coolant getting the oil from the gasket swap. I run full synthetic plus the pricey K&N oil filters so there went almost 40 bucks down the tube.
Anyway beside the point, anybody experance this with there cars? im sure it probley is going knowing the way things seam to work out for me. I'm sure il get that fixed & the tranny will go or something.

Clean you battery terminals really, really well

What are you doing (what do you have running in the car) when the volts go up to ~15

**Forgot**

The computer controls the alternator and it'* output Check the plug in the back of the alternator and make sure its all the way in. If it'* loose and bouncing around, that could do it.

Battery terminals are spotless. It dose this parked & driving, it dosent seem to matter what is going on it stil dose it.
Computer controls the alternators output ? Ive never heard that before, I alwaws thought it was the voltage regulators job inside the back of the alt case. Or have they changed over the years a bit.
Im not trying to say your wrong so please dont take any offince. But I have been out of the loop for a bit & computer controled cars arnt really my thing.

Yeah, things have changed over the years. The alternator field ckt. is constantly being switched on & off via pwd signaling from the PCM to regulate alternator output.