Originally Posted by
EuropeanAM
RangerZ... not even bothering to quote you, as I feel it is beyond DANGEROUS to continue putting some of those statements in print.
Speaking SPECIFICALLY of your "friend's" 250 ProXS Fourstroke that you claim continued to run fine after the battery was disconnected:
-The engine is, EVEN in a Mechanical Shift/Throttle Model Number, a DTS (Digital Throttle and Shift) Engine at it's core. The ignition coils, two fuel pumps, six fuel injectors, starter, main power relay, trim relays, PCM, Voltage Regulator in the Alternator, Throttle Actuator, Shift Actuator, and a full array of sensors onboard the engine all require voltage from the battery to operate. The Alternator's job is NOT to power the engine. It's job is to "maintain the fully charged state of ONE Proper Type, Properly Rated, and Fully Charged Cranking Battery".
-The Engine's PCM monitors Battery Voltage constantly. In the event of LOW BATTERY VOLTAGE, the PCM will enable ENGINE GUARDIAN, and limit Available Power based on the severity of the low voltage event. This includes limiting power to as little as 3% available power in FORWARD GEAR (forced idle). Complete loss of battery would cause this, especially at high RPM's.
-In addition to the above features, the MPR (Main Power Relay) requires an absolute bare minimum voltage of 9.5 VDC to keep the contacts closed. If the contacts open- the engine dies, story over.
-These engines are equipped with an Idle Charge Strategy, which is a PCM Programmed Feature that monitors battery charge condition, and ramps up engine idle speed when or where necessary to provide additional charging output over a shorter period of time. This feature's programming is based on a specific battery design/profile, which would be the battery type specified by the manufacturer (AGM).
-Amperage demands of the engine ramp up as the engine RPM's increase. While some components utilize virtually the same amperage/load, others (such as fuel pumps, ignition coils and injectors) consume exponentially more current. While the alternator's output is increased with engine RPM's, we must remember that the alternator does NOT power the electronics (the battery does).
-One other BIG consideration: Some of the rigs involved in fishing have more than one engine involved. These rigs are often equipped with a BATTERY ISOLATOR (and in many such cases, the alternator is bypassing the engine harness, through an isolator, and then to the BATTERIES). So the engine may react quite differently in such a situation.
In short- and as I stated earlier, I strongly recommend utilizing the AGM Battery type, with AMPLE capacity for these engines (as per the manufacturer's recommendation).
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