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Fiat Punto (176) Factory Service Manual (1993-1999)09 · 55 Electrical system
09 · Electrical

Checking the diodes

Make
Fiat
Model
Punto (176) Factory Service Manual
Year
1993–1999
Section
Recharging system › Checking the diodes
55 Electrical systemChecking the diodes
Alternator with diode pack and bolts indicated by arrows
Alternator viewed from the rear showing the diode pack assembly
- undo the bolts arrowed in the figure and remove the diode pack from the alternator;

Work carefully since the diode pack is glued to the alternator cover.

CHECKING THE DIODES

Checking excitation diodes

Diagram of ohmmeter leads connected across alternator terminals for resistance testing
- Connect the leads of an ohmmeter as indicated in the figure;

NOTE The readings on the three terminals of the excitation diodes should show infinite resistance (no current passing).

Diagram of ohmmeter leads reversed on alternator terminals for resistance testing
- reverse the positions of the ohmmeter leads as shown in the figure.

NOTE The readings on the three terminals of the excitation diodes should show the diode's resistance (current passing).

Parts & tools for this job For 1993 Fiat Punto

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