Posted by Owen Aaland on April 01, 2011 at 16:59:01 from (216.47.32.140):
In Reply to: M Starter posted by S2710 on April 01, 2011 at 12:49:30:
In addition to what Janicholson has posted you should also test them them with a high intensity tester. It will show any areas of poor insulation.
The force to turn the starter comes from the magnetic fields generated in the windings. As result if the insulation gets worn the wires may move either in the armature or fields coils. This means that an armature may pass all the other tests just fine but may fail when in use because the movement of the wires will allow a short to occur. The high intensity tester will find these problems by causing an electrical arc.
The last M starter I worked on had just be repaired at another shop and still would crank properly. The armature looked good but when tested with the high intensity tester it lit up in about six places. Replacing the armature cured the problems.
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