Hi, I'm working on a friend's LT155 who is having problems starting his machine. He did get the machine started for the season (sat all winter in a shed here in PA) using a quick shot starter. After mowing the lawn (about 2 hrs), the machine seemed to charge the battery enough for one start. Second start failed...got solenoid clicking. I put my VOM across the battery. With key off got 12.4VDC; with key turned to start and solenoid clicking I was showing about 5VDC. All consistent with a low/dead battery.
So we fired up the machine again using the hot shot. With engine running I'm seeing 12.4 VDC across the battery terminals. I was expecting at least 13.5VDC, consistent with a charging circuit working properly. Tells me the charging circuit is not working.
So here are my questions: Can you verify my troubleshooting and conclusion that the charging ckt is not working? If you agree, how can I verify what has failed in the charging circuit so I replace the right part? I'm thinking it must be the stator and/or voltage regulator. How can I isolate the problem? Really hoping its the regulator (easier to replace). I think this comes down to what I should be able to see on the stator terminals at the regulator with either a VOM set in AC mode. I have an oscilloscope if needed. If I know what to look for on the stator terminals, I might be able to isolate the problem to the regulator. Or better yet, maybe there is some simple diagnostic you have from experience to isolate the problem.
In any event, any help/advice would be much appreciated!