Testing Ripple Voltage On An Alternator - Fluke 88 V User Manual

Model 88 V
Users Manual

Testing Ripple Voltage on an Alternator

Ripple voltage or ac voltage can be measured by switching
your meter to ac and connecting the black lead to a good
ground and the red lead to the "BAT" terminal on the back
of the alternator (not at the battery).
1. Insert the test leads as shown in Figure 13.
2. Set the rotary switch to
3. Touch the red probe to the "BAT" side of the alternator
and the black probe to ground.
4. Read the display. A good alternator should measure
less than 0.5 V ac with the engine running. A higher
reading indicates damaged alternator diodes.
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