260 amp draw

[outasite]

What is the normal draw of a 260 system just sitting on the trailer? Mine seems to draw the battery down in 3/5 days.Battery is good.CDI box,everything works as it should.

[Tom Foley]

Fuel pump draws from what I know 10 - 12 amps of a 16 amp system . I charge battery fully if possible everyday if on a weekend trip where you are using it everyday and that is without a sound system . With a system you need 2 batteries . I'm using 1000 CCA lead acid , 450 hours on the boat , 3 batteries .
.

[outasite]

Thanks Tom,I'm talking about boat sitting on the trailer no key in the switch.Is it normal for the ECU to draw battery power? My Brucato sits for weeks at a time with no issues

[flabum1017]

Should be zero draw. disconnect one side of your battery, put a volt meter between the battery and disconnected cable, start pulling fuses until the voltage drops below 2 volts.

[outasite]

Got no fuses.Only two draws on the battery.Battery to starter solinoid,and fuel pump.Going to test tomorrow to find out how much draw there is,but it must be a fair amount to pull a battery down that quick.Seems I recall that Merc ECUs draw just sitting.I know that when you hook up a fresh battery there is always a slight spark when you first touch the post.

[patchesII]

An ecu can kill a battery in short order. I killed 800 dollars in lithium batteries last year because I forgot to turn my Perko off after a race for a week. Drained them down to 7 volts and killed them. It depends how it's wired at the engine. Whether it gets power all the time or only when the key switch is on

[Tom Foley]

Should be zero draw. disconnect one side of your battery, put a volt meter between the battery and disconnected cable, start pulling fuses until the voltage drops below 2 volts.

I'm sorry , I misread the question in my haste . Zero draw with a battery switch that isolates all potential draws if installed properly .

[Euroski]

Put a digital volt/amp meter on and see what U have? I heard years ago they must have a battery disconnect switch at least for the engine electronics.

[StratosVT]

It should draw zero if you have a battery shut off switch like most everyone uses.

[RichS]

The ecu draws. You have to disconnect the battery or the ecu.

[Markus]

You need a battery switch.

[Dave Strong]

Battery switch for sure.

Dave

[outasite]

Checked this morning,ECM drawing .56 amp key off.Battery disconnect going in today.Thanks for the info!

[Euroski]

That's 560ma and in the auto world normal draw would usually be under 50ma.

[Dave Strong]

If you have an EFI you need a battery switch, my Bridgeport will kill a battery in 5 days. My Pro Max takes about 10, some Mercruiser ECU'S will kill a battery within a week as well. Any of our customers with a EFI Merc get battery switches installed, 16 amp system will always need to be charged at the end of a long day. Then shut off the switch and good to go next time.

Dave