Alternator Output Test
- Remove alternator connector. Turn ignition switch to ON position. Battery voltage should be present between IG terminal (Black/Yellow wire) and ground. See Figure or Figure .
- On Legend, ensure battery voltage also exists between terminal "S" (Yellow/Blue wire) and body ground. If voltage is not present, go to step 3). If voltage is present, go to step 4).
- On Integra, check for blown fuse No. 24 or open in Black/Yellow wire between dash fuse box and voltage regulator. On Legend, check for blown fuse No. 22 (20-amp) in underdash fuse box, open in Black/Yellow wire between underdash fuse box and voltage regulator or open in Yellow/Blue wire between underhood relay box and voltage regulator.
- Test system using an alternator tester with integral carbon pile (to apply electrical load to system). Operate engine at 2000 RPM. Ensure cooling fan is off. Apply load with carbon pile so voltage drops to no less than 12 volts. Check maximum amperage, and compare with specifications on chart. See Fig 1.NOTE: Due to engine operation, subtract 5-10 amperes from maximum reading.
- If amperage is within specification, charging system is okay. If amperage is not within specification, perform full field test. Full field test can be performed using an alternator tester or by grounding regulator using metal probe through full field access hole in rear housing. See Fig 2.
- If amperage is still not within specification, alternator is defective. If amperage is within specification, replace voltage regulator.