Mercury D2.8L D-Tronic Specifications download pdf (Page 99)

MAINTENANCE

SECTION 5

CMD-4081850 / 90-860094030 SEPTEMBER 2003 Page 91

00000 was CE335

Multiple EDI Engine Battery Precautions

SITUATION

Alternators: Alternators are designed to charge the battery that supplies electrical power

to the engine that the alternator is mounted on. When batteries for two different engines are

connected, one alternator will supply all of the charging current for both batteries. Normally,

the other engine’s alternator will not be required to supply any charging current.

EDI Electronic Control Module (ECM): The ECM requires a stable voltage source. During

multiple engine operation, an onboard electrical device may cause a sudden drain of voltage

at the engine’s battery. The voltage may go below the ECM’s minimum required voltage.

Also, the alternator on the other engine may now start charging. This could cause a voltage

spike in the engine’s electrical system.

In either case, the ECM could shut off. When the voltage returns to the range that the ECM

requires, the ECM will reset itself. The engine will now run normally. This ECM shut down

usually happens so fast that the engine just appears to have an ignition miss.

RECOMMENDATIONS

Batteries: Boats with multi-engine EDI power packages require each engine be connected

to its own battery. This ensures that the engine’s Electronic Control Module (ECM) has a

stable voltage source.

Battery Switches: Battery switches should always be positioned so each engine is running

off its own battery. Do not operate engines with switches in BOTH or ALL position. In an

emergency, another engine’s battery can be used to start an engine with a dead battery.

Battery Isolators: Isolators can be used to charge an auxiliary battery used for powering

accessories in the boat. Isolators should not be used to charge the battery of another engine

in the boat unless the type of isolator is specifically designed for this purpose.

Generators: The generator’s battery should be considered in the same manner as another

engine’s battery.

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Mercury D2.8L D-Tronic Specifications Page 99