2021 795 sport - battery wiring

[moskma]

Having conflicting information - does anyone know whether the battery charger is wired before or after battery switch?  Would like to confirm whether batteries will charge if battery switch(s) are in off position.

[tomch]

Hi

I am running a 2022 MF695 S2. 
The batteries are charged when the main battery switches are switched on or off. It does not matter.

Regards
tomas

[lynnardm]

Moskma

The DC charging system and AC charging system are separate systems. With the main DC main switches off almost everything that’s 12 volt on the boat will not work including the engines. With the DC main switches on then everything that’s 12 v should work including batteries being charged by the engines charger if the engine is running. Of course you likely understand this but I thought I’d state it just for level setting. The AC charging system is a separate system from the DC system and will only work when plugged in to shore power and with the AC charger turned on. The AC charger which converts AC to DC should have a separate charge wire going to each of the boats batteries. So regardless of rhe DC switches the AC charger should send a charge current to the batteries. A voltmeter is a handy tool which can be used to check to see if batteries are being charged among other things. All this said, it’s not uncommon for a new boat to be incorrectly wired resulting in one of the boats batteries not charging when it should be charged. I had this issue for my 895 bow thruster battery.


Capt’n Lynn

[fritz]

Dec 17, 2023 16:49:01 GMT moskma said:

Having conflicting information - does anyone know whether the battery charger is wired before or after battery switch?  Would like to confirm whether batteries will charge if battery switch(s) are in off position.

It's hard to say the Factory is very inconsistent with the wiring. On my 2020 795 series one the battery charger was wired to the hot side of the switches, i.e. will charge the batteries when the switches are in the off position.