I am checking through the shore power on a 88 Bullet I recently purchased and was wondering if anyone can explain to me how the house charger and the large relay on the firewall work together. I would guess that the relay combines the batteries so they are both charged at the same time? Should the relay be normally closed and then would open to isolate the batteries whenever either ignition is turned on?

Also, I was curious about the purpose of the round electrical device mounted directly behind the throttle levers? Mine is missing the knob (?) or lever and is frozen. Dashboard light dimmer? Fume sniffer?

Any help would be appreciated.

Do you have a pic of that device?

Don't know if you are talking about the relay (solenoid)that is just like those used for tab and drives and starter. It is mounted on port side near the battery charger. On my '94 Bullet it parallels both batteries only for starting.

2 cents

here's a photo... I dunno what it is either...good luck with the new boat DR.

My Bullet has this same switch. It is the switch for the silent choice exhaust system.

Its the switch for silent choice.

Mine doesn't have that switch, but there is a clock in that spot.