250 SE Doral battery issues.

[Krackers]

I have a 250 doral that has been in the shop for almost a year. It went in for a trim pump and came out with me having to purchase used engine and have 4 dead 6 volt batteries. I believe the shop fried them not knowing they were 6 volts and ended up wiring up something wrong. What the shop did was somehow disconnected the 6 volt system, battery charger and plugged the accessories into the starter switch.

My question is, can anyone tell me how these for batteries are wired together, how the charge is wired to both the starter and accessory batteries and how they could have possibly switch the accessory wires over to the starter wire? If I'm not mistaken, it looks like the batteries are wired to make a 24 volt system. If that is the case then how does the 12 volt battery charger charge them?

 

[Silvertip]

Re: 250 SE Doral battery issues.

You do not likely have a 24 volt system. What you likely have is two 12 volt systems. Two six volt batteries wired in series - 12 volts. The other two batteries wired in series also makes 12 volts. You need to determine which two batteries service the engines electrical needs and which two service the house (accessory) circuits. Next you need to determine how these two battery banks (the house and engine banks) are interconnected for charging purposes. That may be accomplished with a dual battery switch, an isolator, an ACR (automatic charge relay) or both. We can't see your boat so you need to do some searching and analysis yourself and then report what you find. Pictures help.

 

[Krackers]

Re: 250 SE Doral battery issues.

Thanks for the info, that def answers some questions. Could I not just go back with 2 12 volt batteries rather than 4 6 volts?