Running a battery selector switch without going through alternator?

[k5blazerboy]

Is it possible to run a battery selector switch without running the alternator as the common? What else can I use as a common? I don't wanna run it in parallel either. Just want one switch between two batteries without going through the alternator.

 

[Silvertip]

Re: Running a battery selector switch without going through alternator?

Your question makes no sense. The alternator charges the batteries. How do expect that to happen. You do understand that the batteries get charged through the big red batterry cable from the engine? Why don't you explain what the reaso.ing is so we can understand what you are trying to accomplish. By the way, you don't run the com through the alternator. The alternator feeds the switch and hence the batteries co.nected to it.

 

[k5blazerboy]

Re: Running a battery selector switch without going through alternator?

I have a 2 bank onboard charger, batteries are charged every night. And I have an old 45HP Mercury. That and my batteries are up front. If I have to run 8 gauge wire all the way to the front I will, but I prefer not too.I just wanna be able to switch from my new battery to my old battery if need be. I know running them in parallel will prematurely kill the new battery.

 

[sasto]

Re: Running a battery selector switch without going through alternator?

Run the alternator wire to the starter solenoid where your battery wire connects. The alternator will then feed to the battery through the switch.

 

[Silvertip]

Re: Running a battery selector switch without going through alternator?

You already have the necessary connection to the batteries or you would not be able to start the engine. The big red battery cable serves two purposes. 1) it feeds power FROM the battery to the solenoid and then the starter when cranking the engine. 2) When the engine is running, the alternator sends its charging current TO the battery via that same big red battery cable. So what's the real problem here other than you don't understand the electrical system. That big red cable goes to the COM terminal so starting power can come from EITHER or BOTH batteries. EITHER or BOTH batteries will charge when the engine is running. It is as simple as that. In the BOTH position the batteries are in parallel. In BAT 1 or BAT 2 the system operates like that's the ONLY battery you have.

 

[k5blazerboy]

Re: Running a battery selector switch without going through alternator?

what aren't you understanding I have 3 batteries 1 for cranking two for the trolling motor all I want to know is if I can run the 2 batteries not on the cranking circuit with a switch. I want to be able to switch from battery 1 to battery 2. so let's go over this again 1 designated cranking battery on its own circut. And 2 trolling motor batteries in the bow.

 

[Auger01]

Re: Running a battery selector switch without going through alternator?

I think I know what you are asking. You have a 12V trolling motor and want to use a switch to select which trolling battery powers the trolling motor. Do I have that right? If so, the answer to the question is yes, you can do that. Might even be able to find a switch that doesn't have a "both" setting if you look around a bit.

 

[Bondo]

Re: Running a battery selector switch without going through alternator?

what aren't you understanding I have 3 batteries 1 for cranking two for the trolling motor all I want to know is if I can run the 2 batteries not on the cranking circuit with a switch. I want to be able to switch from battery 1 to battery 2. so let's go over this again 1 designated cranking battery on its own circut. And 2 trolling motor batteries in the bow.

Ayuh,... The 2 batteries at the Trollin' motor, 'n Not the startin' battery,..??

If so, that's easy, put the switch between the 2 batteries...
The motor, 'n it's startin' battery will be Completely independent from the other system...

If yer trollin' motor is 24v, 'n not 12v, No, it can't happen...

 

[Splat]

Re: Running a battery selector switch without going through alternator?

Assuming its a 12volt trolling motor.

The positive cable from the trolling motor will go to COM on the switch.

1 on the switch will to one battery positive.

2 on the switch will go to the other battery's positive terminal.

The negative from the trolling motor will go to the negative on either battery.

You will then have to run a jumper wire between both batteries negative terminals.

Clear. Simple. Answer. For a 12volt trolling motor.

Let me know if you have any questions.

Bill

 

[k5blazerboy]

Re: Running a battery selector switch without going through alternator?

Thank you guys! That's exactly what I was trying to get

 

[k5blazerboy]

Re: Running a battery selector switch without going through alternator?

And why didn't I think of that? Again, thanks a lot guys.

 

[Silvertip]

Re: Running a battery selector switch without going through alternator?

what aren't you understanding I have 3 batteries 1 for cranking two for the trolling motor all I want to know is if I can run the 2 batteries not on the cranking circuit with a switch. I want to be able to switch from battery 1 to battery 2. so let's go over this again 1 designated cranking battery on its own circut. And 2 trolling motor batteries in the bow.

Let's see. We are eight posts into this thread and only now do we learn you have three batteries, not two, and two of them are for a trolling motor that you haven't mentioned until now. Excuse me but my crystal ball is broken and I'm not a mind reader. Had you mentioned this initially, this thread would be about three posts long.