www.iFourWinns.com

Hi all

2 new batteries... only ever use battery one to run stuff when onboard in marina (while connected to shore power and charging )
Today , disconnected shore power , and GPS showed voltage (battery one) dropping in 30 seconds from 12.9 to 9.9 volts.....alarm from GPS low voltage
Shore Power back on..all good....
Battery 2 started engine, battery one wouldn't even turn it over
Went for 1 hour run with battery one selected...to try and charge it from alternator
battery STILL flat on return to shore
Both batteries 1 MONTH old....

how can a battery that new be incapable of charging either from on board charger or when on alternator...
Do I have a bad battery?

thanks !

_________________
Bill P
Marbella, Spain
Vista 248 Year 2000
25th Anniversary edition
Volvo Penta Engine and Outdrive

Sure sounds like a defective battery. Over here, any auto parts store will do a free load test and confirm if it's bad.

If you want to test yourself, just check voltage with a meter right at the battery terminals. If the voltage dropped at the battery, then you have eliminated all the connections as the possible problem.

_________________

"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
tow: 2017 Honda PILOT EXL-AWD
prev. boats:
'87 Chaparral 198CXL 4.3 OMC Cobra
'69 Jetstar 16ft Ski Boat, 115hp Yamaha
'68 Aluminum Jon Boat, 3hp Sears
'64 Water Wings

Are you certain your batt charger's connected corrctly & hasn't blown an inline fuse?
Get a multimeter on the batt's terminals while the charger gets turned on. You'll see voltage increase if it's working.

_________________
2011 Four Winns H180 SS.
Aussie built Mustang 2800.
SOLD - 1997 Four Winns Horizon RS

Thanks....further investigation today ! Pretty poor show if the battery died that quickly after installation !

_________________
Bill P
Marbella, Spain
Vista 248 Year 2000
25th Anniversary edition
Volvo Penta Engine and Outdrive