SPC 20 OPERATOR’S MANUAL
MAINTENANCE E-7
ELECTRICAL SYSTEM
WARNING!
Shut off the engine and use the battery disconnect switch to Lockout / Tagout the machine
before servicing electrical system (See figure B-1B). Electric shock will cause serious injury or
death. This machine may have a 110 volt electrical system. The 110 volt system should only
be serviced by qualified personnel.
FUSES:
There is one 15 Amp in-line fuse between the ignition switch and the field lights switch another 15
Amp fuse is inline between the ignition switch and the head lights. Additional fuses may be installed
with individual options, commonly a 10 Amp fuse supplies power to the cyclone and weigh hopper
options. If required to change a fuse replace with fuse of same amperage and of the same style.
CIRCUIT BREAKERS AND HEAVY DUTY RELAYS:
There are a three 30 amp circuit breakers .(#18517) located under the gauge panel on a standard
combine. The first breaker supplies power to hazard lights the second breaker supplies power to oil
cooler fan, the other powers the ignition switch.
P&B (CUBE) RELAYS:
The relays used for combine functions are located under the gauge panel on the right side of the
driver. To replace a P&B relay (#18916), pull the relay cube straight up to remove. Do not remove
the white plastic retainer from the front of the socket (#18915).
LIGHT SERVICE:
If several lights go out at once, check the appropriate fuse(s). If only one light is out, it may be the
bulb or a loose connection. The lights, bulbs, and part numbers used on the combine are in the
following list:
1. Running Lights
The headlights, rear lights, grain tank lights, etc. are a sealed beam off-road light. They draw 2.5
amps and can only be replaced as an assembly (# 18041). Optional halogen light (#18570) are
also available
2. Interior / Auxiliary Lights
These 2 bulb accessory lights are used in many locations on the combine. These lights draw
approximately 0.6 amps and are purchased as replacement bulbs (ANSI 1895 or # 18283), amber
and clear lenses (#18056,18060), or entire assemblies (# 18061).
3.Gauge Lights
The replacement bulb for the Datcon gauge lights is part number (#16049).
For questions concerning specific options, or for assistance on servicing your equipment
call ALMACO for assistance.
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