Alternator Output, Check
Check can be performed with alternator installed on vehicle or on test stand.
| .D. ICON11.tif | 0,75 | 0,75 | tiff;; Important! |
If performing check using test stand, vacuum pump receives no lubrication; remove vacuum pump - see corresponding operation.
| .D. ICON06.tif | 0,75 | 0,75 | tiff;; Inspect |
Battery - fully charged.
Drive belt condition and tension - satisfactory.
Ground connections for alternator, engine, body, battery - satisfactory.
| Battery terminal - tight, unbroken, not oxidised. | |||
|---|---|---|---|
| .D. ICON11.tif | 0,75 | 0,75 | tiff;; Important! |
Do not reverse polarity of alternator terminals.
Do not short circuit alternator terminals.
Do not run alternator with battery disconnected (diodes may be destroyed).
Circuit diagram for alternator output check
1 Load resistor, variable
2 Battery
3 Voltmeter
4 Ammeter
5 Switch (starter key switch)
6 Charge telltale
7 Alternator
| 8 Charge relay | |||
|---|---|---|---|
| .P. C7197.tif | 9 | 7,5 | tiff;; |
| .D. ICON01.tif | 0,75 | 0,75 | tiff;; Remove, Disconnect |
Ground cable from battery.
| .D. ICON02.tif | 0,75 | 0,75 | tiff;; Install, Connect |
Ammeter between terminal 'B' of alternator and cable to terminal 'B'.
Variable load resistor across battery terminals - ensure resistor set to maximum resistance.
Voltmeter across battery terminals.
Oscilloscope - in accordance with manufacturer's instructions.
Tachometer.
Ground cable to battery.
| .D. ICON11.tif | 0,75 | 0,75 | tiff;; Important! |
|---|---|---|---|
| Do not set load resistor to minimum resistance at this stage. | |||
| .P. C7197.tif | 9 | 7,5 | tiff;; |
Start engine or run alternator.
| .D. ICON07.tif | 0,75 | 0,75 | tiff;; Measure |
Current and voltage - 50 A at 5,000 rpm.
| Adjust variable load resistor if required current is not attained. | |||
|---|---|---|---|
| .D. ICON06.tif | 0,75 | 0,75 | tiff;; Inspect |
Voltage curves on oscilloscope - should be uniform.
| If required current is not attained, or voltage curves appear as peaks and troughs, overhaul or replace alternator. | |||
|---|---|---|---|
| .P. C6227.tif | 9 | 7,5 | tiff;; |