Dual Alternators
#2
im not sure if its the same with diesels,(i dont see why not) but if its is running and you disconnect the positive connection on your battery, and the motor dies, you have a bad altenator, your altenator when motor is started is supposed to charge and run the engine, so if the engine dies when you take off the + cables, it meansyour engine was running off the bateries and the altenator wasnt/isnt doing its job! hope this helpsDustin
#3
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#5
#6
Go by the local parts store and have them test the alternator.
Do a load test on the batteries first so they will need charged, then when they test the alternator output they can get both the voltage and the amperage the alternator is putting out.
I have had alternators that were putting out the correct voltage but no amperage. Truck always seemed like the batteries were dead, and it would not start.
The alternator test showed 14 volts and only 5 amps charge with low batteries and a 125 amp alternator.
Changed the alternator and the test showed 13.8 volts and 120 amps charge.
Problem fixed.
Do a load test on the batteries first so they will need charged, then when they test the alternator output they can get both the voltage and the amperage the alternator is putting out.
I have had alternators that were putting out the correct voltage but no amperage. Truck always seemed like the batteries were dead, and it would not start.
The alternator test showed 14 volts and only 5 amps charge with low batteries and a 125 amp alternator.
Changed the alternator and the test showed 13.8 volts and 120 amps charge.
Problem fixed.
#7
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#9
If you load up the system with all the electrical on you can, a volt meter check will let you know if the alternator putting out amperage. If not the voltage will drop the more you load up the system. Several faults with alternators, worn out brushes and commutator rings, the feild to ground resistance will wander all over when you turn the armature, or a burned out rotor will measure an open feild. These will take out the regulator. Another fault is the diodes burn out or the stator windings break, reducing the output capacity of the alternator, usually will show up as static on your am radio- if anyone listens to them any more!
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