hi,1988 volvo 131 ran boat for first time yesterday.after 15 minutes out came in turned off motor ,got ruck eng wouldnt start just click.took home put battery on charger it shoewd real low.but at ramp would pwr.tilt.ok.1/2 hour after no start tried turned over and fired up shut it off know batts .good .alt when checked with test klight showed good pwr from starter good grd .but terminal marked d t where resistor wire hooks up wouldnt light up test light unless lead put on positive showing it as ground.is this rt?also noticed voltmeter on boat inop.shos power and grd at wiring on gauge.ordered new gauge would this preventfrom charging?thanks for the help ernie also if alts damaged what wouldve caused it.as spare i have shows same thing.please excuse typos fighting 1 yr old for computer while typing.