Alternator - General Problem Diagnosis
87peugeot03BULLETIN NO. 252
DATE: September, 1987
SUBJECT: DIAGNOSIS OF ALTERNATOR PROBLEMS
MODELS: ALL 505 GAS and DIESEL VEHICLES
INFORMATION
The attached trouble shooting procedure is provided to assist you in the general diagnosis of alternator related problems. It applies to all 505 vehicles equipped with a built-in voltage regulator and charge warning light, located in the instrument cluster.
The Service Bulletin has been divided into three sections, each relating to a specific complaint or problem.
NOTE: The customer may not be aware of problem No. 1 and only complain of a dead battery. Always check the operation of the charge warning light with the key on and engine off prior to considering replacement of the alternator.
An inoperative charge warning light or an open circuit in its wiring will not permit energizing of the alternator. If an open circuit occurs in the charge warning system while driving, the alternator will continue to perform normally until the engine is shut off.
1) CHARGE WARNING LIGHTS STAYS OFF "WITH-KEY-ON" (ENGINE-NOT-RUNNING)
ALTERNATOR OUTPUT CHECKING PROCEDURE
PRELIMINARY CONDITIONS
Fully charged battery, minimum 12.2 V, specific gravity above 1225 at 80~F
Correct adjustment of alternator belt
Engine at operating temperature and at 3000 RPM
A) Turn off all accessories - The voltage should be between 13V and 14.8V (at 3000 RPM)
B) Turn on heated rear window, heater fan, and low beams only (A/C off). The voltage should remain within the bracket of 13V and 14.8 (at 3000 RPM)
INCORRECT READINGS
THE NO LOAD VOLTAGE IS LESS THAN 13V AT 3000 RPM (TEST A)
- Disconnect wire 7 or 7A (warning light terminal)
- Apply battery voltage directly to this terminal (on back of alternator)
If voltage is greater than 13V - The energizing diodes are faulty (open)
If voltage is less than 13V - Try with a new voltage regulator
(If the fault persists, replace the alternator)
THE NO LOAD VOLTAGE IS GREATER THAN 14.8V (TEST A)
Measure difference between the voltage at the warning light terminal and the voltage at the output terminal
If voltage difference is equal to OV - Replace the voltage regulator
If voltage difference is greater than OV - Replace the energizing diode or replace the alternator
THE VOLTAGE UNDER LOAD IS LESS THAN 13V (TEST B)
Replace the alternator