I have a 2003 50 hp four stroke on my boat. Yesterday I quickly found that the motor was not charging the battery while it was running. The motor ran the battery down in a relatively short time. I could see the voltage going down on the voltmeter. The motor alarmed out and shut off when the battery got too low. I was able to switch the leads to the trolling motor batteries, I have two in parallel, and was able to get back to the marina. I could see that those batteries were draining while running as well.
My question, is where is the alternator located on the motor. Is is part of the starter. I would like to replace this myself if it is not to difficult to get to.