charging battery

[mike1245]

anyone know of a way to get motor to charge both starter battery and troll battery?

 

[Chris1956]

Re: charging battery

Sure, Connect them to the outboard with a battery switch. After you start the motor, using the starting battery, flip the switch to both. Both will charge. Make sure the switch is the make-before-break type, so it desn't damage your charging system.

What kind of motor are you running? Some don't charge enough to make it worth it.

 

[Silvertip]

Re: charging battery

Even with a high output alternator, you would need to run for hours at wide open throttle to charge a deeply discharged troller battery. Install an on-board charger and plug in at the dock.

 

[mike1245]

Re: charging battery

i guess i should have put that in my first post its a 1975 evinrude 85 hp i put a vilt gauge on the other day just hooked it up to acc on my switch and the ground on the fuel gauge and at idle im pushing 14 volts at wide open its 16 plus
i have a 24 gal tank and do a lot of pullin tubes ist a bass boat but did a lot of mods turned one live well into a cooler ant the other is a trashcan pulled out carpet and rino lined floor it has 2 12 gal tanks now wetsanded entire boat rewired entire boat basically paid 600 with no motor and brought it back from the dead its a 1990 raycraft tri haul trollor motor just used to bet on sandbars and in case of emergency

 

[jtexas]

Re: charging battery

your motor has, at most, a 6-amp unregulated alternator. Once you get up to 14V or so, voltage is irrelevant, it's current you need. And you need a lot more amps to keep the trolling batt charged. I mean, a whole lot more than you have. If you try to charge both batteries with your outboard, you will most likely end up with 2 dead batteries.

Due to the nature of the unregulated charging voltage, be sure to use a high quality wet-cell marine cranking or cranking/deepcycle battery. Other types of batteries won't do so well on the high voltage.