Electrical System Overload Protection-3.0 Tks - Mercury 3.0 MPI ECT Operation & Maintenance Manual

Section 1 - Getting to Know Your Power Package
A dedicated power harness supplies continuous power to the PCM, to ensure uninterrupted operation. This harness is
protected by a 5‑amp fuse, located at the engine's battery.
The MerCathode system has a 5‑amp fuse, which connects to the positive (+) terminal on the controller. If the fuse is open, the
system will not operate, resulting in a loss of corrosion protection.
a
c
b
Electrical System Overload Protection—3.0 TKS
An electrical overload will either open a fuse or open a circuit breaker. You must find and repair the source of the overload
before replacing the fuse or resetting the circuit breaker.
NOTE: In an emergency, when the engine must be operated and the cause for the high current draw cannot be located and
corrected, turn off or disconnect all accessories connected to the engine and instrumentation wiring. Reset the circuit breaker. If
the breaker remains open, the electrical overload has not been eliminated. Further checks must be made on the electrical
system. Contact your authorized Mercury MerCruiser dealer as soon as possible.
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a
c
b
a - MerCathode
b - Red/purple wire
c - 5‑amp fuse
50534
a - 5‑amp fuse
b - Positive battery terminal (harness lead with fuse)
c - Negative battery terminal
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90-8M0113856 DECEMBER 2015
eng