Alternator started sparking
A few of us have posted pictures showing various stages of disassembly.
'73 should have a squareback which is easy to replace parts on.
The BIG danger to the harness is when the output portion of the alternator shorts to ground. When that happens the battery positive is shorted to ground.
Illustrated as example 2 here: Fusible Links in Charging Systems with Ammeter
Basic test would be disconnect the battery. Then check for continuity between the output stud and the alternator case.
When you open it up you can check for continuity between the stator windings and the case, as well as each other.
Like Dana wrote, check the brushes. Before opening the halves, see how much play there is in the rotor.
or the sparking could be enough insulation is missing from windings...
A few of us have posted pictures showing various stages of disassembly.
'73 should have a squareback which is easy to replace parts on.
The BIG danger to the harness is when the output portion of the alternator shorts to ground. When that happens the battery positive is shorted to ground.
Illustrated as example 2 here: Fusible Links in Charging Systems with Ammeter
Basic test would be disconnect the battery. Then check for continuity between the output stud and the alternator case.
When you open it up you can check for continuity between the stator windings and the case, as well as each other.
Like Dana wrote, check the brushes. Before opening the halves, see how much play there is in the rotor.
or the sparking could be enough insulation is missing from windings...
