ALTERNATOR
OUT
FIELD
JUMPER
DISCONNECT
REGULATOR
- A | B | + RED |
BLACK |
|
|
| BATTERY |
|
CHASSIS |
| SOLENOID |
| RELAY | |
|
|
Figure 10
STEPS FOR EXTERNAL REGULATOR (TYPE) ALTERNA- TOR
1.Make connections according to figure 10 above.
2.With ignition key OFF, unplug regulator or disconnect field wire.
3.Measure voltage at alternator field terminal. If at battery volts, jumper the field terminal to the alternator case. If no volts, jumper to the alternator output terminal. If there is no spark when making this connection the field circuit is broken.
Continue to step 4.
STEPS FOR INTERNAL REGULATOR (TYPE) ALTERNATOR
1.Make connections according to figure 10 (above).
2.This test can only be done if the alternator has a terminal for full fielding. Be sure to have specific knowledge of the alternator’s terminals. Grounding the wrong point can damage some alternators or burn up jumpers. A 10 amp (inline) fused jumper can help minimize accidental damage.
3.Apply, or prepare to apply the field excitation when the engine is at idle. Get a helper if necessary.
Continued from step 3
4.Start the engine and slowly bring RPM to 2000. Keep battery voltage between 12.5V and 13.5V by applying loading from the analyzer.
Never let the voltage exceed 16 volts.
5.Remember the amps reading, and return to idle.
6.Shut off the engine, the battery load, and the alternator field.
7.Test Conclusion
a.If output was less than 90% of rating, go back to the Output Resistance Test.
b.Otherwise if the output is okay, the problem must be in the regulator or its wiring.
CAPABILITIES FOR 24V SYSTEM
The
CAUTION
Working with batteries can be hazardous! Please read the SAFETY PRECAUTIONS on the front page of the
CIRCUIT ARRANGEMENTS
Most 24 volt circuits utilize combinations of 12 volts batteries to provide 24 volts to the starter motor, controls and accessories. A CHASSIS battery (or bank of batteries) is used for the engine’s 12 volt circuits, and a CRANKING battery (or bank of batteries) is added to the circuit to provide 24 volts to the starter motor.
Occasionally you may encounter banks of six volt batteries, or even a single 24 volt battery. Six volt batteries may be Load tested individually or in pairs, if wired in series. NEVER attempt to Load
test a 24 volt battery with the PST-1000.
The two most common charging/starting arrangements are the
Always refer to the engine manufacturer’s instructions prior to conducting any tests, as some engines may have components and circuit arrangements that are not included in these examples.
TRANSFORMER RECTIFIER
In a
SERIES PARALLEL SWITCH
While charging, the CHASSIS battery and CRANKING battery are switched in parallel. During cranking, the
The following procedures and diagrams apply to circuits with a negative ground, a CHASSIS battery, a CRANKING battery, and either a
BATTERY LOAD TEST
Batteries wired in series may be Load tested without disconnect- ing cables. Those wired in parallel MUST be disconnected prior to Load testing. Failure to do so will result in loading more than one battery at a time and will yield inaccurate results. Perform Load tests described earlier in the
CAUTION
Always be sure that the Load is OFF before connecting the analyzer’s Load cables to a battery.
To prevent damage to the
STARTER DRAW TEST
This test measures the amount of current drawn by the starter motor during cranking. The procedures apply to both TRANS-
TEST PROCEDURES
1.Connect the analyzer’s Load cables across any 12 volt battery.
2.Make sure all lights and accessories are off and vehicle doors are closed
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