Textron JACOBSEN GP400, Technical/Repair Manual

Page: 89 / 354

ELECTRICAL
4252490-Rev A 4-37
4
Charging Circuit
Symptom: Battery not charging.
No power at 12V accessory socket.
Raise/Lower Circuit
Symptom: Lower solenoid does not energize.
Symptom: Raise solenoid does not energize.
Mow Circuit
Symptom: Mow solenoid does not energize.
Backlap Circuit
Symptom: Reels stop operating after 7 seconds when backlapping.
Probable Cause Remedy
Faulty battery. Replace battery with a known good battery.
Insufficient circuit voltage. Turn the key switch to the run position; check for 12 volts at the alternator electrical
connectors. If the voltage is not approximately 12 volts, diagnose the insufficient
voltage issue.
Faulty 10A fuse (diesel models). Test the 10A F4 fuse. (See “Fuses Test” on page 4-41.)
Faulty alternator output. With the engine running, measure voltage between the positive (+) and negative (–)
battery terminals. If output is not approximately 14 volts, substitute the alternator with
a known good alternator.
Probable Cause Remedy
Open 10A fuse. Test the 12V accessory socket fuse. (See “Fuses Test” on page 4-41.)
Faulty accessory socket. Substitute the accessory socket with a known good accessory socket.
Probable Cause Remedy
Faulty raise/lower switch. Test the raise/lower switch. (See “Raise/Lower Switch Assembly Test” on page 4-45.)
Faulty lower solenoid. Test the lower solenoid. (See “Raise/Lower Solenoid Test” on page 4-46.)
Probable Cause Remedy
Faulty raise/lower switch. Test the raise/lower switch. (See “Raise/Lower Switch Assembly Test” on page 4-45.)
Faulty raise solenoid. Test the raise solenoid. (See “Raise/Lower Solenoid Test” on page 4-46.)
Probable Cause Remedy
Faulty mow switch. Test the mow switch. (See “Rocker Switches Test” on page 4-43.)
Faulty mow/transport switch. Substitute the mow/transport switch with a known good mow/transport switch.
Faulty mow solenoid. Test the mow solenoid. (See “Mow Solenoid Test” on page 4-47.)
Probable Cause Remedy
Faulty backlap switch. Test the backlap switch. (See “Backlap Switch Test” on page 4-44.)