Has someone got a complete wiring diagram showing how to setup a primary and secondary battery and then integrating a 3rd battery into that to be used in conjunction with the secondary battery as a 12/24vdc system for a trolling motor and of course the charging system as well

dick

nope ,,no Trolling Mtr,no charging system,I need complete w/d, but thanks anyway

dick

try this one:
http://www.boatfix.com/how/Ele2.html

Thanks for the effort but still no trolling motor in volved in any of these , heres where i see a problem occuring if you were to add a third battery and had the trolling motor connected in a 24vdc mode betweeen the back up bat and bat#3,what happens to the 12vdc charging circuitry,i can visualize the charging circuit becoming a series/parallel circuit where the charger becomes a power source in series with batterry #3 now do you see where Im coming from in looking for a complete operating set up? I am quite knowledgeable with electricity but can't figure a working situation under these parameters

dick

dick

Well, my Procraft carries the scenario you're talking about. The two batterries for the trolling motor are hooked up on one circuit while the starter battery is hooked seperately. It was pre-wired so the starter battery automatically charges while the motor's running and a switch (up by the trolling motor) that allows the trolling batteries to be charged or to be used. I'm pretty sure the whole thing could be looked up somewhere, perhaps a boat dealer might have the schematics?

Not sure where Rosenburg is, but you might try calling our friends at Rockwall marine or Binder's (817-277-7707 )

I have no doubt it can be done but I can't figure it out The trolling motor under the scenario you are speaking off could not be used in the 24vdc mode if the secondary battey was being used in a back up starting service ,The 3rd battery would need to be isolated to keep the battey from being sourced by the charging system

dick

I bet you could do it with a battery switch of some sort, but I'm not versed enough in electrics to try to explain it. Seems like all the batteries would have to go through double throw switches with a common ground. It'd be a bear to find switches with enough amp rating to keep them from frying when switched to back-up start, if you catch my drift.

Dick, every charging system I've seen has separate leads going directly to each battery, regardless of how the "system" is wired. They do that so the battery chargers will work independent of your wiring system.
As for the wiring of the batteries, are you talking wiring series as opposed to parallel?

I don't know for sure what is being asked but if I am correct you want a standard three battery setup as most 24v boats have. You also want to have the capability to use one of the trolling motor batteries as a backup for the starting motor battery.

If that is correct then the only way you will get a backup is to wire [either] one of the 24v system batteries to the starter in parallel and switch one of the jumpers leads, preferebly the negative wire. I am assuming you don't have a series connection to your starting motor battery as in a 36 volt three battery system.

Does this solve your problem? The starter will never see the 24v system this way and only see the one trolling motor battery when you switch in the negative to that battery, giving you the extra amps you are looking for.

Being a "backup" you are talking about switching in the extra amps. If you want the extra amps continuous I could show you how to do that also but you are right by assuming under that scenario you would be charging both batteries whenever the big motor is running. I have done that before during a tournament when my starting battery would not hold up.