I have a 2008, 115hp 4 stroke yamaha outboard on my 19ft Key west. I am having issues getting it started and it appears to be electrical? We had the symptoms of a dead battery about a month ago. The old battery was over a year old so I went to BJ's and bought a comperable deep cycle marine battery. When we installed it the boat started fine and I ran it that weekend. The next weekend I took it out and it started again fine and I ran it that day and I had no issues. I went to start it the following weekend and it acted as if the battery was dead again. At that point I pulled the new battery off and brought it ashore and and hooked it up to the battery charger. The brand new battery started pulling a complete charge as if it was totally dead? I verified no lights or accesories were turned on in the boat. At that point I took the original battery(which had been charging for two weeks and was showing as fully charged on the battery charger) back out and installed it. The boat still acted as if it had a dead battery (would sluggishly turn over but not enough to start). I did not have a lot of time to fool with it last weekend so I figured I would try again today. I took the now fully recharged new battery back out to the boat and hooked it the the old battery via jumper cables and it still acts as if the battery is dead? I checked both batteries with a volt meter and both are fully charged. When I hooked the volt meter to the battery connections entering the motor itself it is showing full power at that point so I think I can safely say it is getting full juice to the motor. When raising and lowering the motor it now sees like it barely has enough juice to raise and lower the motor? If I have two fully charged batteries, nothing is turned on that would draw power and the motor won't crank and is acting like it isn't even getting enough juice to raise and lower the motor what is going on? Unfortunately I can't even get it to shore to take it to the shop at the moment! Any ideas would be grealy appreciated!
