I been having issues starting. The starter will engage but not turn the engine, or turn about a 1/4 prop arc and stop. We thought the problem was a bad battery (it’s 4 years old) and replaced it with a new one. Started the aircraft with new battery twice on the same day, turned the engine over immediately with no issue. Thought problem was solved. Next day, attempted to start and took several attempts for starter to engage and then it barely turned engine enough to start. Flew aircraft for 20 minutes, after landing started aircraft 2 times with no issue, starter engaged immediately and turned engine no problem.
The previous owner had connected an automobile trickle charger connection to battery, following his habit, I’ve been plugging that in after each flight. I’m wondering if this could be the problem- since the battery charged off the generator no problem after 20 min, is it possible this charger could be depleting the battery somehow?
Yes the trickle charger could be bad causing your issue. You really need a maintainer instead of the trickle charger. There is a difference in the two items. Check battery voltage with a voltmeter before you try starting the plane. Should be around 12 volts if the battery is right. If it is much less then the trickle charger is probably bad.
Elmore City, Oklahoma
N906C 108-3 Continental O-470
I had a similar problem with my Stinson. Mine turned out to be the stud that goes into the starter and connected to the relay. Apparently, it had backed out over time and made a poor connection. If I got it started and ran it the engine would start just fine when the metal had expanded. I pulled the starter relay nut off and was able to turn that stud in the starter about a full turn to tighten. Put it back together and it spins like a windmill.