Bobcat 331 - Electrical System

A
P–21151
1
Batteries contain acid which burns eyes and
skin on contact. Wear goggles, protective
clothing and rubber gloves to keep acid off
body.
In case of acid contact, wash immediately with
water. In case of eye contact get prompt medical
attention and wash eye with clean, cool water
for at least 15 minutes.
If electrolyte is taken internally drink large
quantities of water or milk! DO NOT induce
vomiting. Get prompt medical attention.
W–2065–1296
Operation & Maintenance Manual–45–
331/331E/334 Excavator
ELECTRICAL SYSTEM
Description
The excavator has a 12 volt, negative ground electrical
system. The electrical system is protected by fuses located
under the cover at the right side of the excavator (Item 1)
[A]. The fuses will protect the electrical system when there
is an electrical overload. The reason for the overload must
be found before starting the engine again.
The battery cables must be clean and tight. Check the
electrolyte level in the battery. Add distilled water as
needed. Remove acid or corrosion from the battery and
cables with a sodium bicarbonate and water solution.
Put Battery Saver P/N 6664458 or grease on the battery
terminals and cable ends to prevent corrosion.
Fuse & Relay Location
A decal is inside the cover to show location and amp
ratings.
Remove the cover to check or replace the fuses and relays.
The location and sizes are shown below and [B].
Fuses
Ref Description Amp. Ref Description Amp.
1 Wiper 5 7 Ignition 5
2 Switched Power 20 8 Fuel Solenoid 25
3 Alternator/Power Relay 25 9 Controller 25
4 Attach. Control Device 25 10 Attach. Control Device 25
5 Not Used – 11 Lights 20
6 Air Cond., Heater Fan 25 12 Accessory Plug 15
Always replace fuses using the same type and capacity.
Relays
RefDescription
E Switched Power
F Fuel Solenoid
G Lights
H Glow Plugs
J Starter
B
6808602
R e l a y sFuses Fuses
1
2
3
4
5
6
7
8
9
10
11
12
E
F G H
J