Sabre 15538 Hydro - DIAGNOSTICS; CRANKING & FUEL SHUTOFF SOLENOID CIRCUIT DIAGNOSIS

DIAGNOSTICS ELECTRICAL
4 - 10 3/5/97
CRANKING & FUEL SHUTOFF SOLENOID CIRCUIT DIAGNOSIS
Test Conditions:
• Meter negative (—) lead on battery negative (—) terminal
• Ignition switch in OFF position • Meter positive (+) lead on numbered test point
Test/Check Point Normal If Not Normal
1. Battery positive terminal 11.8-13.2 volts Test battery
2. Starter solenoid front cable terminal Battery voltage Check positive battery cable
3. Plug in fuse under operator’s seat Battery voltage Check fuse and red/wht ignition wires
4. Ignition switch terminal red wire Battery voltage Check red ignition wires
Test Conditions:
• Blade Drive OFF • Transmission in neutral
• Park brake engaged • Ignition switch in START position
NOTE: Perform the tests below one at a time, allowing the starter to cool between tests. Do not allow the starter
to crank for more that 15 seconds, and allow 30 seconds for starter windings to cool. If starter mechanism
is not turning, windings may still be conducting current and heating up. Disconnect starter cable from
starter (and isolate cable terminal) if cranking circuit or fuel shutoff solenoid (and not starter) is being
tested.
Test/Check Point Normal If Not Normal
5. Ignition switch terminal purple wire Battery voltage Replace ignition switch
6. Blade Drive Switch purple wire Battery voltage Test purple wire back to ignition switch
7. Blade Drive Switch purple/white wire Battery voltage Check Blade Drive Switch and lever
8. Park brake switch purple/white wire Battery voltage Test purple/white wire back to blade switch
9. Park brake switch purple wire Battery voltage Check park brake switch and lever
10. Starter solenoid purple wire Battery voltage Test purple wire back to park brake switch
11. Starter solenoid ground terminal
(black wire)
Greater than 0 volts
Less than 0.2 volts
Greater than 0.2 volts
- check starter
solenoid ground circuit black wire.
0
volts - replace solenoid
12. Starter solenoid battery terminal
(red wire, rear terminal)
Battery voltage Clean terminals at battery and solenoid
Test red battery wire for shorts or breaks.
13. Starter solenoid starter terminal
(red wire, front terminal)
Battery voltage Clean battery terminals.
Replace starter solenoid
14. Starting motor Battery voltage Clean battery terminals.
Check red wire back to solenoid.
Test starter (see engine manual)
Fuel Shutoff Solenoid Test:
(16 hp only)
(Ignition Switch In Start Position)
15. Ignition switch yellow wire Battery voltage Replace ignition switch
16. Fuel shut-off solenoid yellow wire Battery voltage Check yellow wire back to ignition switch
17. Fuel shut-off solenoid black wire Greater than 0 volts
Less than 0.2 volts
Greater than 0.2 volts
: check engine ground
0
volts: replace fuel shut-off solenoid
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