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Boat mechanic I have 2 starting batteries -when I am running…

Boat mechanic I have 2 starting...
Boat mechanic
I have 2 starting batteries -when I am running the boat can I set the battery selector to all or do I need to select battery 1 or battery 2 only - if i pick all will both batteries be charged- i have an 18 foot flats boat with a 2014 135 etec motor.
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Answered in 5 minutes by:
8/15/2017
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,116
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Hello, I'm Tan. Welcome to JustAnswer. I'm reviewing your question and will reply momentarily.

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When running the boat you may put the switch on both. When you stop and are using accessories I would turn switch to bat # 1 or 2. This way you only drain one battery. That way you always have a good battery.

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Customer reply replied 6 months ago
Now if I were to leave it on all would it still combine both batteries when starting thereby negating the need to switch to 1 or 2 and then back
Customer reply replied 6 months ago
Also when it's in all will it be charging both batteries while the engine is running?
Customer reply replied 6 months ago
On all not in all

Yes in all position is both batteries together. The only time you want to switch to 1 or 2 is when you are sitting with a drain on batteries. Switch to one or 2 engine off.

In all position the engine charges both batteries.

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Customer reply replied 6 months ago
Gotcha wouldn’t 2 together be the same as 1 deeply drained plus another at near max

Well the reason you want to use just one battery is if your out in the middle of nowhere and you kill both batteries how do you get home. If you use just one battery and kill it you will still have a good battery to get home with.

2 batteries will last longer but how far do you discharge them before you realize they are to low to start the engine?

Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,116
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
Verified
Tan and 87 other Boat Specialists are ready to help you
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Customer reply replied 6 months ago
Gotcha thanks
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Tan
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,116
11,116 Satisfied Customers
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

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