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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Try unhooking your alternator and test again for a draw. Alot of times a diode in the alternator will go bad making a short directly to ground.

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Have you not watched the alternator output voltage with
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Just installed new battery and gauge still drops below 14 amps when i put on a/c,use power windows and has stalled while driving a couple of times

The problem will be in the alternator,it is not charging enough,and it is on it`s way out,If this was at all helpful,please rate,the voltage at the battery should read with a volt meter,13.65 volts to 14.25 volts with the headlights are turned on,and ac on high blower motor.If it is not in this range,replace the alternator.

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My 1995 gmc truck has a weak starting crank

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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.
  2. Open the hood, and with the car engine off, loosen the negative battery cable so that it can be removed with little effort. With the battery cable still loosely attached to the terminal, crank the engine, then pull the battery cable completely free of the terminal. If the engine continues to run, the alternator is providing enough voltage to power the electric circuits that provide spark to the spark plugs, electric fuel pumps, etc. You can increase the demand on the alternator by turning on headlamps, heater blower fans, and other electrical accessories to determine the draw capability of your alternator. If the engine immediately dies when the cable is removed, the alternator is probably bad
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
Cooling fan- 15 amps
Headlights - 10 amps
A/C blower - 10 amps
Rear Dfrst - 15 amps
High Beams - 10 amps
Fuel Pump - 10 amps

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