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Nissan Micra Alternator Diode Check & Reassembly - Service Manual Page EL-28

Service procedure covering alternator diode conduction tests and reassembly steps including brush positioning.

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This is page EL-28 from a factory service manual's Electrical (EL) section covering the Charging System — Alternator. The left column continues the alternator Diode Check procedure, showing illustrated conduction tests for the negative diode (figure SEL907A) and the sub-diode (figure SEL910A); in both cases, if the conduction test fails (N.G.), the instruction is to replace the diode assembly. The right column covers alternator Reassembly with three cautions: (1) solder each stator coil lead wire to the diode assembly terminal as quickly as possible; (2) when soldering the brush lead wire, position the brush so its wear limit line protrudes 2 mm (0.08 in) beyond the end face of the brush holder (illustrated in figure SEL055D, showing solder points and the wear limit line); and (3) before installing the front cover with pulley and rotor with the rear cover, push the brush up and retain it by inserting a brush lift wire into the brush lift hole from outside, then remove the wire after installation (figure EE540). The page gives no explicit year, model, or engine applicability but matches the format of Nissan service manuals.

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Frequently asked questions

What should I do if the alternator negative diode or sub-diode fails the conduction test?
If the conduction test is N.G. (no good), replace the diode assembly.
How far should the brush wear limit line protrude when soldering the brush lead wire?
Position the brush so the wear limit line protrudes 2 mm (0.08 in) beyond the end face of the brush holder.
How do I hold the brushes in place when reassembling the alternator?
Before installing the front cover with pulley and rotor with rear cover, push the brush up with fingers and retain it by inserting a brush lift wire into the brush lift hole from outside. After installing, remove the wire.
Is there a caution when soldering stator coil lead wires to the diode assembly?
Yes — carry out the soldering operation as fast as possible when soldering each stator coil lead wire to the diode assembly terminal.

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