UDPs eating batteries alive

It's not the UDP's. How many miles total on the car? What is the voltage while the car is running? Do you have any high power amplifiers or other audio/video equipment that did not come original with the car?

Nevermind. Didn't read well last night... Yeah probably your alternator.

It's also possible that the alternator is on it's way out.

NastyStang113 said:

It's also possible that the alternator is on it's way out.

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+1

Sounds like a bad Alternator to me. Simple check as what was mentioned before, check the voltage the alternator is putting to the battery (it should be somewhere around 13.5 - 14 volts). Another trick you can try, is while the car is running, disconnect the positive lead from the battery, if the car wants to stumble or even stall, then the alternator is not putting out enough voltage to keep the car running. Or, you can take the alternator out and take it and auto parts store and have them load check it.

One thing to remember is the alternator charges the battery based on the amount of voltage drop it is sensing.

Example - If you're driving during a rainy night, with all the lights on, fog lights on, heater on, wipers on, and radio on, the voltage drop the alternator senses is more than what it would be if you were driving during the day (no accessories on). In this situation the alternator will work harder to maintain the proper voltage to the battery. The thing with the alternator may be that it won't act-up until it gets warm and then the voltage regulator doesn't get the proper signal to send the proper amount to charge the battery.

Obviously you have witnessed, a car can run with a bad alternator and a good battery, for a short amount of time, before the battery can no longer support the entire system. Sorry for the long explanation, just wanted to give people an understanding of how it works, not just an answer. Hope this helps. Good luck!

With 60k miles on the clock i tend to agree with the others that it may be your alternator.

Look for a LEAK !

The exact thing happened to my wifes 06 !!! The dealer replaced the battery, fixed..... Then again no juice? Dealer said he missed it, its the Alt. and replaced it all warrenty work ! Again no juice !!! After the forth "FIX" and three weeks in the shop with the Service Manager driving it back and forth to home it died on her. Check in the car passenger side panel right of where your feet would be, theres two computer "things", when it rains it drips on them and weard stuff happens they resealed the fender and problem fixed that was 10K miles ago. Can't hurt to check it out!

Oh yeah!! I forgot that some of the S1972 have a water leak issue by the passenger foot well. You might want to check that too.

Yeah, I didn't think about the infamous water leak issue. USUALLY that's accompanied by other symptoms, but that could surely cause the issue. If your alternator is testing out fine, definitely check that out.