HotTommy
Lieutenant Junior Grade
- Joined
- Mar 15, 2013
- Messages
- 1,025
I recently purchased a Yamaha F115TLR, # 68VL1063xxx. I beleive it was sold in 2006. While checking it out I discovered an apparent charging problem. I connected my multimeter to the two lugs that connect the main power cables from the engine to the battery. With everything off I have 12.4 on my freshly charged battery. With the engine running at idle (on muffs), the voltage drops to 12.1. I briefly bumped the RPM up to 2,000 and the voltage did not change, so I assume there is a charging problem. I have worked on car engines and outboards before, but this is my first Yamaha. Here are my questions.
- Is this a normal voltage reading at idle?
- If not, what are the most likely root causes?
- What do you recommend to troubleshoot the problem?