Alternator: Testing and Inspection

Fig. 7 Alternator Test Connections:

Fig. 6 Connecting charging system analyzer:

1. Ensure battery is fully charged and that alternator belt, connections at alternator and main fuses are in satisfactory condition.
2. Ensure that fuse No. 9 on 1989-90 models or fuse No. 15 on 1991-92 models, in the dash fuse panel and fuse No. 38 on 1989-90 models or fuse No. 22 on 1991-92 models, in underhood relay box are in satisfactory condition.
3. Disconnect electrical connector from alternator.
4. Turn ignition switch on and ensure battery voltage exists between alternator connector black/yellow wire terminal and ground, and between yellow/blue wire terminal and ground, Fig. 7. If no voltage exists, check for blown fuse No. 9 on 1989-90 models or fuse No. 15 on 1991-92 models, or open in black/yellow or yellow/blue wires.
5. Connect Sun VAT-40 charging system analyzer or equivalent to system as shown in Fig. 2, then position selector switch in No. 1 position.
6. With all accessories Off, start engine, move selector switch to No. 2 position, then remove inductive pickup and zero ammeter.
7. Reconnect inductive pickup, ensuring arrow on pickup points away from battery.

Fig. 8 Alternator Test Specifications:

Fig. 9 Alternator Test Specifications:

Fig. 8 Full field access hole location. 1988-91 Integra (1988-91 Legend similar):

8. Ensure cooling fans are off, accelerate and hold engine at 2000 RPM, then apply a load with carbon pile so that voltage drops to no less than 12 volts. Check maximum amperage reading and compare to specifications, Figs. 8 and 9. Subtract 5 to 10 amps from reading to allow for engine operation.
9. If reading obtained in previous step is within specified range, charging system is operating normally. If not, proceed to next step.
10. Attach probe to full field test lead on analyzer and insert probe into access hole at back of alternator, Fig. 5. Switch analyzer to ``A'' (ground) position and check maximum amperage reading. Voltage will rise quickly when performing this operation. Do not allow voltage to exceed 18 volts, or damage to system may result.
11. If reading obtained in previous step is not within specified range, replace alternator. If reading obtained is as specified, replace voltage regulator.