ALTERNATOR NISSAN B13 with HARD TO FIND FAULT

This section I will explain hard to find fault as it was repaired, which is that the light of failure of the charging system lights up the board, "the  battery image", even with the switch off and especially at times high humidity or rain. Apart from being intermittent. Not sufficient that the battery is discharged.

The following image shows only the alternator disassembly, do not show the procedure

 

After several armed / disarmed the alternator, not achieved against failure. This was revealed with a careful observation of the head housing screw terminal connection or main exit, where you can see a small part of the copper wire of the diode bridge, which is right at the apex of the screw, see the next picture.

IDENTIFIED FAILURE

Could be said that this would be easy to find fault with the tester, but this failure to present only when the rust on the screw separator, pictured below, is mixed with moisture and produce a short circuit to earth or ground primarily through diodes. In the photo above is also observed a break in the connection of a diode, I made to isolate and identify the fault.

Screw / terminal with traces of rust in the separator

The repair involves in the removal of a vertex roughing screw, in order to increase the distance and reduce possible contact

Reduced vertex screw

In addition to applying a coating of insulation that can be nail polish, to the discovery of copper conductor.

Repairs completed

Since this compensation is no longer presented the fault.

I think the Bosch`s quality control jump this detail.
And I do not know how many more alternators that are circulating in the street when they not find the fault, they decide or replace the entire alternator or diode bridge.

I hope they can use this experience to anyone in need.

I appreciate your comments