Battery Questions

CARIBOU · Jul 24, 2019

1989 Sundancer twin 7.4,s 3 batteries. I have had conflicting info on proper battery switch positions on my boat. Previous owner left switch on BOTH position when on shore power and not starting engines for 3-5 days. Should I be leaving it on BOTH and when on the hook turn switch to either 1 or 2 to save one battery for engine start up when needed. Is there a quick way to decipher between which is the house batteries or the starting battery .There are 3 deep cycle batteries all hooked to the switch.

Bt Doctur · Jul 24, 2019

With twin engines you should have 2 battery switches, 1 should have a stand alone battery, the other should have 2 in parallel

CARIBOU · Jul 25, 2019

Bt Doctur said:
With twin engines you should have 2 battery switches, 1 should have a stand alone battery, the other should have 2 in parallel

Is the stand alone the starter and the two in parallel the house.?

be_prepared · Jul 25, 2019

Wine Dn Down said:
Is the stand alone the starter and the two in parallel the house.?

Probably the standalone is the starter battery for one engine, the 2 in parallel are the house bank, but also the starter for the other engine.

CARIBOU · Jul 25, 2019

Okay its making sense now. I will be at the boat tomorrow and I will figure out which battery starts the genny. I thank you for your help. So when on the hook switch to house batteries as to leave single battery charged for starting.

Bt Doctur · Jul 25, 2019

the genny should also have its own battery

Battery Questions

CARIBOU

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Bt Doctur

Well-Known Member

CARIBOU

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be_prepared

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CARIBOU

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Bt Doctur

Well-Known Member

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