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A quick and dirty solution.
Posted by JD From LA (more from JD From LA) on Tue, 8 May 2001 01:01:09
In Reply to: Having problems with battery/alternator., Floyd, Mon, 7 May 2001 23:08:45
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Floyd:
Get the car running and put a DC voltmeter across the battery terminals. Observe polarity and hook the positive test lead to the positive batt terminal, etc.
If the voltage while running is 12.8 volts to 14.8 volts, the alternator is probably ok. Have the battery load tested. It may not hold a charge anymore.
If the voltage is less than 12.8 volts, the alternator MAY be bad. First try revving up the engine to about 1500 rpms and checking the meter. If the meter reads within the above range, check alternator belt tightness and fix if necessary.
If the voltage is still low hook the positive test lead of the voltmeter to the large positive terminal behind the alternator. That terminal has a wire leading to the battery positive terminal. If the voltage at the alternator is good, the aforementioned wire is bad.
If the voltage is STILL low, the alternator isn't charging, but it may only be bad brushes. You can take the alternator off and have it tested at this point. If the brushes are bad, check your Bentley manual for repair info.
Now, If the voltage observed from the first test is GREATER than 14.8 volts, the voltage regulator is overcharging the battery. Your SAAB's regulator is built into the alternator but may be fixable if the the bad regulator hasn't caused he alternator windings to burn out.
Good luck.
JD
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