Textron Jacobsen AR-5 Technical/Repair Manual

4-54 4181383 First Edition
ELECTRICAL
4
Symptom: Engine temperature gauge does not indicate a temperature.
Horn and Audible Alert Circuit
Symptom: Horn does not sound when horn switch is pressed.
Symptom: Horn does not sound during lamp and audible alarm check.
Symptom: Horn does not sound with engine oil pressure light on.
Probable Cause Remedy
Faulty engine temperature sensor. With a jumper wire, connect the engine temperature sensor to ground.
With the key switch in the run position, check the gauge. If the gauge is
indicating full scale, replace the engine temperature sensor.
Faulty engine temperature circuit. Check continuity between engine temperature gauge grn wire terminal and the
engine temperature sensor terminal. Continuity must be indicated.
Faulty switched power circuit. With the key switch in the on position, measure voltage between engine
temperature gauge org/wht terminal and ground. Voltage must be
approximately 12 VDC.
Faulty ground circuit. Check continuity between engine temperature gauge blk wire terminal and
ground. Continuity must be indicated.
Faulty engine temperature gauge. Replace the engine temperature gauge.
Probable Cause Remedy
Faulty horn switch. With the key switch in the run position, pressed the horn switch. If the horn
does not sound, test horn switch.
Faulty horn. Connect a test light between horn terminals (pnk/blk and blk wires).
With the key switch in the run position, pressed the horn switch. If the test light
turns on and the horn does not sound, replace the horn.
Faulty switched power circuit. Measure voltage between horn switch org/wht terminal and ground. Voltage
must be approximately 12 VDC.
Faulty horn switch circuit. Check continuity between horn switch pnk/blk wire terminal and horn pnk/blk
wire terminal. Continuity must be indicated.
Faulty ground circuit. Check continuity between horn blk wire terminal and ground. Continuity must
be indicated.
Probable Cause Remedy
Faulty horn. With the key switch in the run position, pressed the horn switch. If the horn does not
sound, see “Symptom: horn does not sound”.
Faulty horn output circuit. With the key switch in the run position, check control module audible alarm output LED. If
the LED flashes at 0.5 second rate for approximately 3 seconds and the horn does not
sound, check continuity between horn pnk/blk wire terminal and control module horn
output terminal J3-10. Continuity must be indicated
If the LED does not turn on, substitute the control module with a known good control
module.
Probable Cause Remedy
Faulty engine oil pressure switch input
circuit.
With the key switch in the run position and engine off, check control module engine oil
pressure switch input LED. If the LED does not come on, check continuity between
engine oil pressure switch terminal and control module engine oil pressure switch
input terminal J2-1. Continuity must be indicated.

Textron Jacobsen AR-5 Specifications

General

Brand	Textron
Model	Jacobsen AR-5
Category	Lawn Mower
Language	English