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Bad Alt?



I'll build a test harness tonight. Good idea

>-----Original Message-----
>From: Allyn [mailto:amalventano1@tds.net]
>Sent: Monday, November 27, 2006 07:22 AM
>To: julie@menloparkrandd.com, ''Org, Scirocco''
>Subject: RE: Bad Alt?
>
>Fully charge battery (off the car).
>Connect battery, but with an ammeter in series on the (-) post.
>Observe (assumed) noticeable drain.
>Commence removing possible loads (fuses, alt charging line, etc), until current takes drops to negligible.
>
>Previous things I've caught on the herd:
>- trunk light interior light switch faulty (a2 jetta)
>- faulty audio amplifier (still on even though 'turn-on' lead low)
>
>Note - bad supply to the exciter wire would not cause a drop to 4v overnight, as the car is off for that duration (I assume).
>
>HTH
>Al
>
>> -----Original Message-----
>> From: julie@menloparkrandd.com [mailto:julie@menloparkrandd.com] 
>> Sent: Monday, November 27, 2006 6:58 AM
>> To: Org, Scirocco
>> Subject: Bad Alt?
>> 
>> My brandy new battery is being discharged over night by some 
>> thing. Fully charged in the evening, its about 4v in the morning.
>> 
>> I measured the 12v to the exiter with the alt disconnected 
>> and I get 12v. Add the alt and the voltage drops to 
>> millivolts. Battery light lights correctly during this time. 
>> On turn on I get 14+ volts at the blue wire. I am wondering 
>> if the alt has a short.
>> 
>> 1) Bad alt?
>> 2) Bad supply to the blue exiter wire.
>> 
>> Which would be more common.....
>> 
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>
>