Efi Electrical System Precautions - Mercury MerCruiser 8.1S Installation Manual

GASOLINE ENGINE 8.1 S INBOARD MODELS

EFI Electrical System Precautions

NOTE: All references to EFI models apply to EFI and MPI Engines. The following precau-
tions apply to all EFI models.
Avoid damage to the EFI electrical system and components. Refer to the following
precautions when working on or around the EFI electrical harness or when adding
other electrical accessories:
•
DO NOT tap accessories into engine harness.
•
DO NOT puncture wires for testing (Probing).
•
DO NOT reverse battery leads.
•
DO NOT splice wires into harness.
•
DO NOT attempt diagnostics without proper, approved Service Tools.
Instrumentation
If Quicksilver wiring harness is used, and a fused accessory panel is to be installed
(40-amp current draw maximum), be sure to connect it as shown in wiring diagram.
Do not connect accessory panel at any other location, as wires in wiring harness
may not be of sufficient size to handle current load.
We recommend the use of Quicksilver Instrumentation and Wiring harnesses. On dual
station applications, oil pressure and water temperature senders (on engine) must be
changed. Refer to Quicksilver Accessories Guide for selection.
The 4 basic gauges, which must be used with the engine, are:
•
Tachometer
•
Oil Pressure
•
Water Temperature
•
Voltmeter
Route instrumentation wiring harness back to engine, making sure that harness does not
rub or get pinched. If an extension harness is required, be sure to secure connection
properly. Fasten harnesses to boat at least every 18 in. (460 mm), using appropriate
fasteners.
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