TM 5-3800-205-23-1
TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0005 00
TROUBLESHOOTING USING MULTIMETER - CONTINUED
Alternator Voltage Test.
12.
NOTE
This test measures alternator output voltage.
a.
Ensure engine is OFF.
b.
Place battery disconnect switch in ON position.
c.
Turn all accessories OFF.
d.
Engage parking brake.
e.
Ensure transmission select lever is in N (Neutral), and transmission neutral lock control is in locked position (TM
5-3800-205-10-1 or TM 5-3800-205-10-2).
f.
Remove protective cap from test connector receptacle.
g.
Select VDC on multimeter.
h.
Connect positive (red) lead from multimeter to test connector pin 9.
i.
Connect negative (black) lead from multimeter to test connector pin 7.
NOTE
Batteries need over two (2) minutes to charge to voltage range required for the following test, especially if
machine being tested was boost started.
j.
Start engine.
k.
Slowly speed up engine until 2440 RPM is indicated on tachometer.
l.
With multimeter connected to pins 9 and 7, observe multimeter for an indication between 26.2 and 28.9 volts. If
indication is less than 26.2 volts (undercharge condition), the problem could be:
(1)
Loose or broken alternator drive belts. Tighten or replace alternator belts (WP 0032 00) and retest.
(2)
Starter-to-engine block ground cable damaged, loose or missing, Tighten or replace ground cable (WP
(3)
Defective batteries. Charge batteries (WP 0067 00) and retest. If problem still exists, replace batteries
(4)
Defective alternator. Replace alternator (WP 0034 00).
m.
If indication is more than 28.9 volts (overcharge condition), replace alternator (WP 0034 00).
n.
Allow engine to idle for five (5) minutes before turning engine OFF.
o.
Remove multimeter leads from test connector receptacle.
p.
Install test connector receptacle protective cap.
13.
Starter Solenoid Power Circuit Voltage Test.
NOTE
This test measures voltage drop across starter solenoid pull-in coil.
a.
Ensure engine is OFF.
b.
Place battery disconnect switch in ON position.
0005 00-9
