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J31-1, (+) BATTERY VOLTAGE INPUT
J31-10, FLASHING AND HOUR METER OUTPUT
B-1 CHASSIS GROUND
FIGURE F.14 – IDLER/ENGINE PROTECTION PC BOARD CODES 11199 AND 11408
FLASHING VOLTAGE TEST
(Engine not running (continued)
PROCEDURE (continued)
10. Connect positive voltmeter probe to the Idler /
Engine protection PC board J1 pin 10 for Code
10856, (J31 pin 10 for codes 11199 and 11408).
Connect the negative probe to a good chassis
ground connection or the negative battery termi-
nal.
11. Move the run/stop switch to “run” and read the volt-
age within 30 seconds of switching to “run”.
If battery voltage is detected:
Test the flashing diode and resistor assembly, and the
two diode and leads connecting the negative side of
the D1 bridge rectifier to chassis ground. Also check all
of the wiring and connections between the Idle / Engine
Protection PC board, and the positive brush terminal.
See the wiring diagram.
If battery voltage is not present, move the positive
probe to J1, pin 1 for code 10856, (J31, pin 1 for Codes
11199 and 11408), and check the voltage.
If no voltage is present, check the run/stop switch, the
circuit breaker, and all connections between the bat-
tery, engine starter solenoid, ammeter, run/stop switch,
idler switch, circuit breaker, and the idler/engine pro-
tection PC board. See the wiring diagram.
If battery voltage is present at J1 pin 1for code 10856,
(J31-pin 1 for codes 11199 and 11408), check that the
Idler/Engine protection PC board is properly grounded.
Lead wire #5A connects J1 pin 5 to chassis ground for
code 10856. Wire GND-A connects terminal B1 to
chassis ground on codes 11199 and 11408.
12. If the idler/engine protection PC board is getting
power, and has a good chassis ground connec-
tion, but is not producing flashing voltage during
the first 30 seconds after power-up. Replace the
Idler/Engine Protection PC board
When testing is complete, replace all covers and close
the doors.
TROUBLESHOOTING AND REPAIR
F-40 F-40
SAE-400 SEVERE DUTY
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