Yes i read the other rb25 alternator thread but it doesnt help me, i run a rb25/30 and i use a 25 wiring loom and a 25 alternator, my old alternator was suspect to be faulty so i got a new second hand one from kyp. And now when my car is running the battery is about 9v and when its off its normal bout 12v. I cant understand why this would be, the 2 pin plug the thicker of the two has 12v on it and the skinnyer has about 6v. Then theres the bolt that comes out the back of the alternator and the has 12v also but 9 whn running. Help much appreciated

Quote: Originally Posted by evl 25t [View Post] Yes i read the other rb25 alternator thread but it doesnt help me, i run a rb25/30 and i use a 25 wiring loom and a 25 alternator, my old alternator was suspect to be faulty so i got a new second hand one from kyp. And now when my car is running the battery is about 9v and when its off its normal bout 12v. I cant understand why this would be, the 2 pin plug the thicker of the two has 12v on it and the skinnyer has about 6v. Then theres the bolt that comes out the back of the alternator and the has 12v also but 9 whn running. Help much appreciated the alternators ****ed.

I thought that but what i want to no is why its draging it down, usually if they are stuffed it just wont charge

Sounds like the reg is shot. Might be able to get one from Nissan or covs