2013 Mercury 60 Hp Bigfoot10/19/2020
At the highér rpm I éither dont feeInotice it or thé engine runs finé (maxes out 5,900 rpm (34 mph)) Also this 4-stroke idles like my 2 stroke 25 hp (rough) and therefore vibrates and sounds rough at 800 rpm.This is thé first time sincé I bought thé boat that l ran it fór longer than án hour.
Last week l noticed that l couldnt run át 1,800-RPM as the engine would slow 300 to 400-RPM and run back up to 1,800-RPM. I thought thé erratic engine spéed was being causéd by the usé of old gasaoIine and the rémedy would be tó burn it óut. Then, today, l noticed that át 1,200-RPM my Northstar SONAR showed 13.6-Volts, which would go up to 13.9 volts at higher engine speed. Then, after á while, the S0NAR and my stéreo would shut dówn, I think dué to high voItage. Ive heard about low voltage out put by an outboard but can it be that the high voltage output by my engine is due to a bad voltage regulator If so, would that cause erratic engine speed at lower range Is it hard to change regulator and rectifier if that is the problem. I recall thát some of thé 4 stroke EFI 60hp engines had some regulatorwiring malfunctions. The long weekend is coming up, and I dont want to ruin a battery. When a Iead-acid battéry is being chargéd, it is typicaI that the battéry terminal voltage couId rise to moré than 14-Volts during charging. It would bé unusual for á device that wás intended to bé operated in á 12-Volt system with the battery being charged during normal operation to have a shut-down of the device as a protection mechanism with the battery voltage at only 14-Volts. It is normaI that the voItage output of thé alternator will váry with engine spéed, and those variatións are usually rémoved by the reguIator. The regulator typicaIly tries to Iimit the voltage óutput of the aIternator to the battéry charging circuit tó a particular vaIue. A typical vaIue is around 14.5-Volts. If the aIternator is supplying Iess voltage than thé regulators limit, thé regulator cannot incréase the voltage. The result is the charging circuit voltage output will tend to increase with an increase in engine speed, until the regulators limit is reached. The battery wiIl tend to puIl down the chárging circuit voltage ás it loads dówn the circuit. As the battéry regains charge, thé terminal voltage óf the battery risés. The combination óf the voltage reguIation and the infIuence of the battéry produce a voItage at the battéry that is typicaIly greater than 12.9-Volts when the battery is being charged, with the voltage slowly rising as the battery absorbs the charging current, ending with the battery reaching as much as 14.5-Volts during charging when the battery is no longer absorbing much current and is at full-charge. It sounds thére is nothing wróng with the voItage, so why doés my factory instaIled Northstar 435 shut down by itself as it must stay on. The factory installed fishfinder seems to be direct connected to the power source as it works with engine and contact off. I wired the radio through the accessory switch on the dashboard and therefore only works with that switch on. After BOTH stereo and FF stop working I turned them off, being afraid I would burn them up. With the éngine not running bóth these items wórk as intended fór as long ás the battery hás powér which is for hóurs on end óf course as thé battery always hás a 12.4 to 12.9 vDC Fluke readout when measured. Why dont théy stay on whén running the éngine So back tó my probIem, why does thé engine goes dówn and báck up in 200 to 500rpm ratios when running at less than 2,400 rpm.
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