SAAB WIS ONLINE

Checking the voltage drop at the positive andnegative alternatorterminals

Checking the voltage drop at the positive and negative alternator terminals



1. Connector a voltmeter across the battery's positive terminal and terminal B+ on the alternator (insulated side).

2. Run the engine at 2500 rpm and apply an electrical load to the alternator by switching on all the lights, for instance. Read off the instrument.

3. Connect a voltmeter across the battery's negative terminal and terminal B- (ground) on the alternator.

4. Run the engine at 2500 rpm and apply an electrical load to the alternator by switching on all the lights, for instance. Read off the instrument.

5. The readings in points 2 and 4 should not exceed 0.5 V. If a higher reading is obtained, check the relevant circuit for shorting/continuity.