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Will this battery switch charge my trolling motor batteries?

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Will this battery switch charge my trolling motor batteries?

Old 06-30-2020, 07:58 PM
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Default Will this battery switch charge my trolling motor batteries?

My battery switch is on the house battery but I can switch to this yellow area that adds the trolling motors also in case the house battery is dead. My question is if I leave it on this yellow tab will the alternator charge the trolling motors as well?
Old 06-30-2020, 09:35 PM
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Originally Posted by Smoak352 View Post
My battery switch is on the house battery but I can switch to this yellow area that adds the trolling motors also in case the house battery is dead. My question is if I leave it on this yellow tab will the alternator charge the trolling motors as well?
Going by the label, that Yellow would connect the start to the house, not the trolling motor. I have the same switches. The next question is what voltage is your tm? If its not 12V then it wouldn’t work no matter what you do. The house and start are both 12V. TM are usually 24 or 36 volts.
Old 07-01-2020, 10:52 AM
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Originally Posted by proaudioguy View Post
Going by the label, that Yellow would connect the start to the house, not the trolling motor. I have the same switches. The next question is what voltage is your tm? If its not 12V then it wouldn’t work no matter what you do. The house and start are both 12V. TM are usually 24 or 36 volts.
I have 4 batteries; a starting battery and 3 deep cycle for the trolling motor. I know the yellow position adds another battery, not sure which one. My starting battery was low and would not start the boat so I switched to the yellow position and it fired right up. Maybe this is connected to one of the trolling motor batteries?
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Old 07-01-2020, 11:42 AM
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Originally Posted by Smoak352 View Post
Maybe this is connected to one of the trolling motor batteries?
Interesting.
The other switch is indeed labeled "36V Trolling Motor"
so presumably that is what you have.

If you in fact have only 4 total batteries,
then yes, its possible that the first of the three series TM batteries
is also connected as a house battery and runs through that switch.

In which case,
if you left the switch on "combine" while running
then one of the 3 TM batteries would receive some charging.

It would not recharge the 2nd and 3rd battery, though
so it would be of little to no benefit to the trolling motor.

But its an odd arrangement in any case
and begs the questions:
- how is the house load normally powered
when the dual circuit switch is simply 'on' -
is there not a voltage sensitive relay ?

- how do the TM batteries get re-charged?

Last edited by Fwpratt; 07-01-2020 at 11:49 AM.
Old 07-01-2020, 11:47 AM
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I drew you a picture. Each battery is 12V. This is likely how yours is wired. The 3 batteries in series are 36V to the TM. Your 2 bank charger wouldn’t even work with this unless it can do 36V. What charger do you have?
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Old 07-01-2020, 12:39 PM
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Originally Posted by Fwpratt View Post

- how do the TM batteries get re-charged?
Maybe his 2 bank charger, charges the 2 remaining TM batteries.

In any case, this arrangement is one of the dumbest I have seen, particularly on a boat and it appears to be intentional.
Old 07-01-2020, 12:47 PM
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Get a 5th battery. Use the 2 bank to charge the house and start, and get a 3 bank for the TM.
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Old 07-01-2020, 12:49 PM
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OR....replace the 3 TM batteries with 1 single 36V TM battery. Then you can have 2 house batteries in parallel or drop the weight down to 3 batteries. There are really nice 36v LION batteries. That uses its own charger. Your existing 2 bank can still charge house and start batteries.
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Last edited by proaudioguy; 07-01-2020 at 01:00 PM.
Old 07-01-2020, 12:51 PM
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Originally Posted by proaudioguy View Post
Maybe his 2 bank charger, charges the 2 remaining TM batteries.

In any case, this arrangement is one of the dumbest I have seen, particularly on a boat and it appears to be intentional.
It’s the way my Pathfinder is wired as well. I have a four bank charger. The wiring to the TM battery is back up to the starting battery. Knock on wood, I have never had to use the all switch to start but in an emergency it pulls power from the TM battery to start.
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Old 07-01-2020, 12:53 PM
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Originally Posted by proaudioguy View Post
Maybe his 2 bank charger, charges the 2 remaining TM batteries.

In any case, this arrangement is one of the dumbest I have seen, particularly on a boat and it appears to be intentional.
Not sure why it's dumb. It uses an existing battery to parallel the starting battery if he needs it. The dumb part might be thinking it would charge 3 batteries in series.
Old 07-01-2020, 01:02 PM
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Originally Posted by mikefloyd View Post
Not sure why it's dumb. It uses an existing battery to parallel the starting battery if he needs it. The dumb part might be thinking it would charge 3 batteries in series.
Its dumb because there is no mechanism to simply charge the 3 TM batteries to the same level. Don’t get your panties in a bunch though. Just opinion. Worth what it cost.

Does any boat that uses a TM have a way on board to fully charge it without solar cells or shore power? Are there any systems to charge 36V TM batteries from running the boat?

Last edited by proaudioguy; 07-01-2020 at 01:10 PM.
Old 07-01-2020, 01:08 PM
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Originally Posted by bsh102 View Post
It’s the way my Pathfinder is wired as well. I have a four bank charger. The wiring to the TM battery is back up to the starting battery. Knock on wood, I have never had to use the all switch to start but in an emergency it pulls power from the TM battery to start.
Your 4 bank charger helps the situation considerably. I think we are still missing information on this.
Old 07-01-2020, 01:29 PM
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Originally Posted by proaudioguy View Post
Are there any systems to charge 36V TM batteries from running the boat?
There's the Trolbridge 36,
the Minn Kota MK-3 Alternator Charger
either will 'allow charging' of 3 TM batteries
by the main engine alternator -
Old 07-01-2020, 03:09 PM
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Originally Posted by Fwpratt View Post
There's the Trolbridge 36,
the Minn Kota MK-3 Alternator Charger
either will 'allow charging' of 3 TM batteries
by the main engine alternator -
Trollbridge looks like a fancy VSR that switches battery to battery. I don’t really know. Cool stuff though. MK looks interesting. Substantially larger. Almost like an invertor and 3 bank charger in one unit. I have their 3 bank that runs on edison and so far its been great. What about 36volt batteries, rather than 3 12V? If I ever go with a TM, I will have to use one of those 36V LION.
Old 07-01-2020, 04:00 PM
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Originally Posted by proaudioguy View Post
Its dumb because there is no mechanism to simply charge the 3 TM batteries to the same level. Don’t get your panties in a bunch though. Just opinion. Worth what it cost.

Does any boat that uses a TM have a way on board to fully charge it without solar cells or shore power? Are there any systems to charge 36V TM batteries from running the boat?
Typing slower; I liked the set-up to parallel the starting battery for starting. I did not say the charging was a good idea. If it were my boat I would put in a battery charger for the TM batteries and plug it in on the lift.
Old 07-01-2020, 05:06 PM
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OP we cant tell how your boat is wired from a picture of a battery switch

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