I have a '08 traker pro guide V16. the engine starts but nothing else that runs off the main battery doesn't work. I checked the fuses andthey all seemed fine. How ever. that main battery is 5 years old and only keeps a charge for a few days before it needs charging. I put it on a battery charger untill its fully charged but the lights and gauges still wont work. Do you think it could be the battery? any help will be appreciated