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help on battery problem - dead alternator?

darconi
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darconi Member

darconi

Posted
Posted

Appreciate any help anyone can provide on this.

I've been having this problem where my battery has been discharging/dying while driving. If I leave the battery connected and the car off, it pulls power like normal but once the car is on and I start driving for a while, it discharges rapidly. I'm estimating somewhere around 20-30 mins of driving for entire battery to be discharged from full. The battery checks out fine and has been recharged using chargers.

I got a battery voltage monitor that hooks into the lighter and it constantly tells me the voltage.

Once the car is on, the initial voltage starts at approx 13.5-14 V (which is normal for recharging I believe). However, it quickly over the next few minutes drop down considerably. After ~2-3 minutes, the recharge voltage enters the 12.5-13 range (and the monitor gives me a red warning). After another 5 minutes or so, it can be around 11.5-12.5 range and so on.

I'm guessing this indicates my battery is not being recharged and the only thing I can think of is alternator is not working. I did take it to autozone once and they said the alternator is fine but not sure I believe them.

I did had to replace the ignition switch before (thanks to renntech), is it possible I didn't install it right and its draining cause of that?

Would appreciate any help/suggestions. Is this something I can take to any mechanic or should I contact a porsche speciality shop?

Thanks!

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RFM Member

RFM

Posted
  • Moderators
Posted

I would suspect the voltage regulator ( build in alternator ). Let check the alternator again during at least 30 minutes under load, try to create the same conditions as you have experienced while driving.

darconi Member

darconi

Posted
  • Author
Posted
I would suspect the voltage regulator ( build in alternator ). Let check the alternator again during at least 30 minutes under load, try to create the same conditions as you have experienced while driving.

If I did that and it is the voltage regulator, what should I expect?

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RFM Member

RFM

Posted
  • Moderators
Posted

If it is the voltage regulator, you can (let) replace the regulator for a couple of $, and do the test again.

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