INSTALLATION MANUAL
90-864198020 Page 33 of 77
Electrical Connections
CAUTION
Avoid damage to the EFI electrical system components: Refer to the following pre-
cautions when working on or around the EFI electrical harness, or when adding oth-
er 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.
IMPORTANT: When routing all wire harnesses and hoses, be sure they are routed and
secured to avoid coming in contact with hot spots on engine and to avoid contact
with moving parts.
Instrumentation Connections
We recommend the use of Quicksilver Instrumentation and Wiring Harnesses. On dual sta-
tion applications, oil pressure and water temperature senders (on engine) must be changed.
Refer to Mercury Precision Parts / Quicksilver Accessories Guide for selection.
The 4 basic gauges that must be used with the engine are:
• Tachometer
• Oil Pressure
• Water Temperature
• Voltmeter
IMPORTANT: Connect fused accessory panel (40-amp current draw maximum) must
be connected as shown in the wiring diagrams.
1. 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.
2. Fasten harnesses to boat at least every 18 in. (460 mm), using appropriate fasteners.
3. Place hose clamp over instrumentation wiring harness.
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