Jacobsen AR3, Technical/Repair Manual

Page: 108 / 342

ELECTRICAL
4181384 First Edition 4-51
4
Charging Circuit
Symptom: Battery not charging.
Symptom: Alternator light stays on.
Probable Cause Remedy
Faulty alternator output circuit. Make sure alternator output cable and battery positive (+) cable terminals are clean and
tight.
Check continuity between starter battery terminal and battery positive (+) terminal.
Continuity must be indicated.
Faulty battery ground circuit. Make sure battery negative (–) cable terminals are clean and tight.
Check continuity between battery negative (–) terminal and ground.
Continuity must be indicated.
Faulty battery. Check specific gravity of the individual battery cells.
Probable Cause Remedy
Open fuse 7.5A fuse F7. Test fuse. (See “Fuse Test” on page 4-61.)
Faulty control module switched power
circuit. With the key switch in the run position, measure voltage between control module terminal
3 and ground. Measure voltage between control module terminal 8 and ground.
Voltage must be approximately 12 VDC.
Faulty alternator. With the engine running, measure voltage between jump start connector terminals.
Voltage must be approximately 14 VDC.
If the voltage is below 12 volts, replace the alternator.