ENGINE
TM 5-3805-258-24-2
TESTING
BOSCH ALTERNATOR TESTING AND ADJUSTING
ALTERNATOR TESTS
Pole Body (Stationary Field Coil) Tests
Toois Needed:
6V3030 Digital Multimeter
6V3032 Test Leads
Test Lamp 24V 10W
Generate; Test Bench
Suppression Capacitor Test
Remove cover plate from rectifier. Disconnect
suppression capacitor lead (1) from D+ terminal.
Connect ohmmeter between suppression capacitor
lead and terminal B(–).
SUPPRESSION CAPACITOR TEST
1. Suppression capacitor lead.
If the meter reading is not 200K ohms or more, then
replace the suppression capacitor.
WARNING
Discharge the suppression capacitor after
testing. This prevents the igniting of cleaning
fluid from sparks
caused by capacitor
discharge.
POLE BODY
(Alternator Disassembled for Illustration Purposes)
1. End frame. 2. Field winding leads. 3. Winding pole.
Remove regulator cover and regulator.
Winding Continuity Test
Connect ohmmeter between the field winding leads
(2).
POLE BODY WINDING CONTINUITY TEST
2. Field winding leads. 4. Rectifier bridge lead.
The resistance should be 7 to 9 ohms.
If the resistance test values are not correct, there is
an open or short between the windings (2).
5-12g
