new alternator now battery and brake light blink in unison

[SkiRoy]

well quite a happy saturday it's been. it started out with me going to change out the bad alternator on my 89 single cam 240. so I changed out the bad one with the good one which was verified at napa and shucks to be good. but after lifting the car and getting this replacement done I turn on the car and my brake light and the battery light blink in slow unison. thinking or hoping that it would go away if I drove it for awhile didn't work but the lights turned steady. but when I stopped they started blinking again. so I hook up my handy dandy multimeter to a dc voltage of 11.97 at idle. I rev up the engine and she stays at 11.97. I believe that it's supose to be at 13vdc or so. so any help in what you guys think the problem could be would sure help.

[BobSilva]

Howdy,

I'm having exactly the same problem. Did you ever get a resolution?

Thanks,Bob

[mrbizness1]

I had the exact problem on a maxima, I even got the same voltage readings. If I shut it off and restarted I could get 11.9 or 14.5. The problem is a bad diode in the alternator. I went through a few alts in a month from pep boys before getting a Nissan rebuilt from a dealer.