How to Replace the Alternator in a 1989 Saab
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A multimeter is a cheap and convenient way to measure electrical flow.multimeter image by dinostock from Fotolia.com
Borrow or buy a multimeter, which is a device for determining electrical charge. Turn your car on and open the hood. Locate your alternator by referring to your owner's manual. - 2
The reading on the multimeter will determine if you need to replace your alternator.analog multimeter image by Paul Moore from Fotolia.com
Adjust your multimeter to measure volts. Take the red lead from the alternator, the positive one, and attach this to the positive sign ("+") on the alternator. Take the black lead and attach it to the body of the alternator, thereby establishing a a ground. Read what the multimeter says: If it is over 13 volts, the alternator is in good shape and working properly. However, a reading below this indicates either the magnets inside the alternator are worn out or the alternator coil itself may be broken. In the latter case, the alternator needs to be replaced. Turn your car off. - 3
The car alternator can be removed with some patience and the right tool.dead battery image by Katrina Miller from Fotolia.com
Observe your alternator. Locate the two bolts that hold the mounting bracket in place, which is what holds the alternator to the engine block. One bolt is at the end of the alternator, away from the belt; and not far from this bolt is the second, which is near the end of the long bolt that allows the alternator to rotate to permit belt tension. Using an adjustable wrench, undo the two bolts holding the bracket to the engine block. - 4
After replacing the alternator, check to make sure it is working.New car petrol engines image by Christopher Dodge from Fotolia.com
Replace the alternator with a new one. Fit alternator belt over the alternator. Re-screw in bolts. Turn the car on. To be safe, check the multimeter reading on this new alternator. As before, it should be at least 13 volts. If so, your car should run smoothly.
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