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Battery charger wiring help

Old 06-30-2020, 08:52 PM
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Default Battery charger wiring help

So.. New to me boat.. First time having 3 batteries...I have 2 batteries hooked up to a 2 bank onboard charger for the 24v trolling motor and a cranking battery for the motor..I have a 4 way switch with off, 1,2 and 1+2. I'm having to replace the cranking battery as it's bad, and mystery to me is that it has a cable running negative to negative to one of the trolling motor batteries, not sure what that's for.... Ideally I'd like to be able to charge all 3 batteries with the 2 bank charger if possible and also be able to charge all 3 with the engine (Yamaha F225)..I guess what I need to know is if this is possible with my current setup and how should it be wired.... Like to make it right while I'm in there.... Thank you
Old 06-30-2020, 09:03 PM
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This is not possible.
I do not believe an alternator will charge a 24V system.
You need a 3 bank charger for charging at the house.
Your switch should not ever connect the trolling motor batteries to the start battery. If you are concerned about emergencies, the tm battery Pos that connects to the neg of the other TM battery would be the one to jump, since there is a ground from that battery already jumped to the start battery.
Old 06-30-2020, 09:11 PM
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Originally Posted by proaudioguy View Post
This is not possible.
I do not believe an alternator will charge a 24V system.
You need a 3 bank charger for charging at the house.
Your switch should not ever connect the trolling motor batteries to the start battery. If you are concerned about emergencies, the tm battery Pos that connects to the neg of the other TM battery would be the one to jump, since there is a ground from that battery already jumped to the start battery.
Ok thanks...I know that at least 1 of the trollng motor batteries are connected to the red switch because I was using one to crack the motor because of the bad battery.. Starting to make a little more sense to me.. I've only dealt with 2 batteries before... Cranking and bait well/backup battery
Old 06-30-2020, 09:38 PM
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I could draw a diagram if I had a sheet of paper.
Old 07-01-2020, 03:28 AM
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sounds like this is your current arrangement
(you may have direct negative cabling, not using a bus bar)

Name:  12v-from-24-TM-batteries-copy.png
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if you put the battery switch on 1+2 while running the two-bank shore charger,
the cranking battery will also receive charging current


to charge all three batteries from the Yamaha's output,
requires additional equipment,
you have at least two choices:

- a Minn Kota "Alternator Charger"
- a Yandina Trollbridge
https://www.yandina.com/troll12X24info.htm
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Last edited by Fwpratt; 07-01-2020 at 06:07 AM.
Old 07-01-2020, 05:18 AM
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Originally Posted by Fwpratt View Post
sounds like this is your current arrangement
(you may have direct negative cabling, not using a bus bar)

Attachment 1116092

if you put the battery switch on 1+2 while running the two-bank shore charger,
the cranking battery will also receive charging current


to charge all three batteries from the Yamaha's output,
requires additional equipment,
you have at least two choices:

- a Minn Kota "Alternator Charger"
- a Yandina Trollbridge
https://www.yandina.com/troll12X24info.htm
It looks to me when switch goes to 1 +2, the 24 volt battery will send 24 volts into the 12 volt battery frying it and other electronics.
Old 07-01-2020, 06:10 AM
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Originally Posted by sdowney717 View Post
It looks to me when switch goes to 1 +2, the 24 volt battery will send 24 volts into the 12 volt battery frying it and other electronics.
there is only one point where there is 24v to ground:
the battery terminal to which the trolling motor,
- only the trolling motor -
is connected.
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Old 07-01-2020, 07:12 AM
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Originally Posted by Fwpratt View Post
sounds like this is your current arrangement
(you may have direct negative cabling, not using a bus bar)

Attachment 1116094

if you put the battery switch on 1+2 while running the two-bank shore charger,
the cranking battery will also receive charging current


to charge all three batteries from the Yamaha's output,
requires additional equipment,
you have at least two choices:

- a Minn Kota "Alternator Charger"
- a Yandina Trollbridge
https://www.yandina.com/troll12X24info.htm
If it is rigged this way.. What happens if I run the boat in 2+1...I may have done this unknowingly trying to charge all the batteries or at least 2 of them.. Hopefully I didn't fry anything
Old 07-01-2020, 07:25 AM
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Originally Posted by waterman74 View Post
If it is rigged this way.. What happens if I run the boat in 2+1....
No harm done by that, nothing can get 'fried".

But no benefit except possibly making that TM battery
a bit stronger 'backup battery' for cranking -
if you needed it.

And doesn't help in terms of battery capacity to run the trolling motor,
since that would be limited by the other TM battery that doesn't get any charge.



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