jenifer

I just recently bought a volt meter gauge for my 2006 rx8. Its one that plugs into the ciggerate lighter. It seems pretty acurate but my question is ... When i put the car into reverse its drops to 13.8. When i put her in drive she goes to 15.0 then down to 14.4.. While driving her with no load she will drop to 13.8.. Is this normal?!

Mr.Mango

iTrader: (2)

Yes that is fine, it will fluctuate.

You just dont want it to be over charging (IE 15-17V) and you dont want it to be low (under 13V while hi beams are on & blower motor are on high)

jenifer

Okay. She does jump to 15.0 when im going to reverse. Or sometimes drive. And at idle she stays at 13.6 when i drive her she goes to 14.3. Today at start up i noticed what appears to be a bearing sound. So im thinking maybe my alt is going bad.

Mr.Mango

iTrader: (2)

Those numbers are perfect. I wouldnt worry about 15V for a couple seconds, its the constant running at high voltage which can damage your battery & electronics (mainly due to the amperage). Check your A/C belt tensioner, and actual tension of the belt.

If your worried about the alternator get a load test done, most places usually do them for free and that should tell you the exact condition of the alternator.

jenifer

Alright, thanks so much..