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Author Topic:   low batteries
tarracott posted 05-10-2002 03:40 PM ET (US)   Profile for tarracott   Send Email to tarracott  
I have 2 low batteries on my Montauk (it has a dual battery system in the console). Can I jump start them with a car and jumper cables? Are there any secrets to this?
Whaler Proud posted 05-10-2002 04:25 PM ET (US)     Profile for Whaler Proud  Send Email to Whaler Proud     
Tarracott: Do the batteries hold a charge?
tarracott posted 05-10-2002 04:40 PM ET (US)     Profile for tarracott  Send Email to tarracott     
Yes, they are just dead from lack of winter use.
Jerry Townsend posted 05-10-2002 04:47 PM ET (US)     Profile for Jerry Townsend  Send Email to Jerry Townsend     
Tarracott - yes, you can jump your boat boat battery(s) to you car battery. But, consider just hooking up a battery charger - easier, probably cheaper, But, realize that if the battery is REALLY DEAD, some battery chargers will not pick it up and then requires jumping to a vehicle battery/charging system to get the dead battery off the bottom - to where the battery charger can pick it up.

Secrets - not really - just make sure that you hook positive to positive and negative to negative. ---- Jerry/Idaho

Outraged posted 05-10-2002 07:11 PM ET (US)     Profile for Outraged  Send Email to Outraged     
Also, if the batteries are not maintance free, check the water in them as well.
triblet posted 05-10-2002 07:36 PM ET (US)     Profile for triblet  Send Email to triblet     
It's a really good idea to keep a battery
on a smart trickle charger when it isn't
used for a long time. I don't drive my
'Vette much, it lives on one, and I think
the battery in it is nine years old.

The Montauk goes on one too whenever it's
in the garage, which is five days a week.

It's REALLY BAD for a starting battery to
get run dead flat. Deep cycle batteries
are more tolerant.


lae posted 05-11-2002 12:43 AM ET (US)     Profile for lae  Send Email to lae     
I buy decent batteries (buy by weight) and rotate them out of marine service into shop rigs every third year. Yeah, don't run them dead dead. Easy to fix a dead shop truck battery along the highway.
jimh posted 05-11-2002 09:02 AM ET (US)     Profile for jimh  Send Email to jimh     
I would avoid trying to jump-start the boat if possible. Let the batteries regain a charge from a charger.

The problems with jump starting:

--you risk some high current sparking, which can generate some rather strange effects, including destroying diodes in things attached to the battery circuit (like the diodes in the alternator/charging circuit of the outboard).

--once you start, your outboard will be trying to charge two dead batteries, which will put a heavy load on its charging circuit. Since this is a MONTAUK, you probably have an outboard motor that develops its charging current from a frail little stator winding under the flywheel and is rated for 6-Amps. Run around for a few days with this circuit pegged-out delivery maximum output trying to charge the batteries and you may just cook the coil windings of the stator. That will have you looking at a big repair bill.

--it is better for the battery condition to rebuild the charge in them slowly with a modest current applied over a long time. This will produce better chemistry in the battery plates.

If you are stuck 40 miles offshore, get a jump start. If you are stuck in your driveway, use an AC-operated battery charger and let it run on the low-current setting for several days.

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