Question about 1999 Oldsmobile Silhouette

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I may have a short on my 1995 silhouett

I have put on 2 alternators and it still will drop below 8 amps on the amp gauge from time to time, it seem to be worse more at low speed than high. It never fails to start. Also the radio changes station all the time by its self. Thanks jarrell

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Find the ground wire off the block and follow it prob to the fire wall and take it loose wire brush behind it and on the connector and tighten it back up. gm put thiere grounds over paint alot of times

Posted on Dec 31, 2008

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Why 1991 Bonneville has 8 amp draw with all fuses pulled?


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How do I check alternator amperage on a 2001 maxima?


  1. Check the gauges, if the car is equipped with them. If you have a volt/amp gauge, it will read the alternator output for you. Turn on the blower fan for the AC or Heater, the headlamps, and any other accessories that put a strain on the alternator, and watch the gauge to see if it decreases voltage or amperage. As a rule, if the voltmeter is higher when the engine is running then when the engine is not, you can confidently assume that the alternator is charging.
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1. Put a voltmeter as close to the alternator as possible. (Positive and Negative both.) If you can put the meter leads directly on or in the wire coming off the alternator that would be optimum.

2. Now start the car and turn all accessories off and check the voltage level. It should be between 13.5 and 15.1 volts. (depends on your make and model of car) It is a good idea to write down all voltage readings your taking. The main thing your looking for is a drop in voltage. Once you hit around 12.5, your alternator is not going to produce any additional amperage.

3. Now turn on one accessory at a time. Write down that accessories fuse rating. Keep turning on accessories and adding fuse ratings until the voltage falls to 12.5. Now add 15 amps if your electric cooling fans are on and 10 amps per battery in your system. Your numbers may look like this.

2 batteries- 20 amps
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High Beams - 10 amps
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