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W
i
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C
o
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r
W
i
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s
o
n
p
o
R
e
d
t s
r a
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T
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s i
Yellow/Red
W
i
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f
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m
s
a t
Stripe
P
o
w
e
r
e l
a
d
Brown/Yellow
s
w
i
c t
. h
S
e
n
s
o
r
w
i
D
a
k r
G
a r
y
a t
c
h
o
m
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. r
B
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w
n
/Orange
L
e
a
d
s
o t
i b
g l
B
o r
w
n/Red
L
e
a
d
s
o t
a
u
W
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b
t e
w
e
e
P
u
p r
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r f
o
m
g i
n
t i
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p
a
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l e
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O
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A
c
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s
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e i
P
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S
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s
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Yellow
G
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u
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d
G
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G
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e
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B
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w
l
g i
t h
G
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B /
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S
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n r
l
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t h
Note: Some of these colors can serve more than one type of circuit.
Figure B31 Wiring Color Codes
F. Stray Current Corrosion
1. General
Electrically induced underwater corrosion occa sionally
affects boats and their related compo nents. This is
referred to as "Stray Current Corrosion" and appears
as surface pitting or deteri oration. Stray current
corrosion is the de composi tion of chemi cal com-
pounds by electric current. Keep all electrical connec-
tions as high as possible above the waterline.
Stray current corrosion can be caused by the polarity
of the dockside wiring system of the boat being
reversed from the power source (re versed polarity) or
surrounding boats, an improp erly wired battery
installation, other boats that are in close proximity that
have electrical power leakag es, or any other source
close to the boat that has electri cal power leakage into
the water. Jet nozzle(s) are especially vulnerable to
stray current corrosion.
Periodi cally in spect the jet nozzle compo nents and
thru-hull fittings to determine if stray current corrosion
damage exists. If corrosion damage is found, deter-
mine and correct the cause of stray current to prevent
Boat Systems - Section B
W
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D
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(
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m
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r.
further damage. Consult an experienced marine
electrician or contact your Scarab dealer for assis-
tance.
o t
The use of some shore power battery chargers while
. d
the boat is in the water and the battery is connected to
the system can cause stray current corrosion. Have
o
r
an experienced marine electri cian review any battery
charger installation to ensure a stray cur rent corrosion
r
t
o
problem will not devel op. An improper battery connec-
tion is a com mon cause of stray cu rrent corrosion.
Use only UL Marine – ignition protected
i
e r
battery charg ers. Consult your Scarab Dealer
o i
n
for recommendations.
Corrosion is usually more prevalent in polluted or salt
water than in fresh water. It is also more likely to occur
when dock age is in an area with steel piers, large
metal boats, or where shore power is in use.
2. Galvanic Corrosion
Galvanic corrosion results from a potential electri cal
difference existing between dissimilar metals im-
mersed in a conductive solu tion (e.g., salt or brackish
water). If these metals touch or are otherwise electri-
cally connected, this potential difference produces an
electron flow between them. The attack on the more
active metal is usually in creased and the attack on the
less active metal is decreased, as compared to when
these metals are not touching.
3. Corrosion Prevention
Anti-corro s ion (sacrificial) an o des are attached to
certain parts of the jet nozzle compo nents to reduce
corrosion. The anode corrodes, rather than the part to
which the anode is attached. Periodic inspection of the
sacrificial anodes is necessary. Change each anode
when 50% of its weight has corroded away.
Anodes are attached at the following locations:
• Ride shoe/cooling plate
• Pump housing
• Reverse gate support
• Steering nozzle
• Reverse gate.
Please refer to the section on "Sacrificial Anodes" in
your engine manufacturer's manual for additional
information. The engine manual is included in the
owner's packet.
NOTICE
Owner's Manual Page 62
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