Yanmar 3JH5E Starter Finicky Lately ??

[rdkinard]

Recently, our 2010 Yanmar 3JH5E diesel starter won't turn over if it sits for a few days, unless our Battery Charger is putting out over 14 volts. We changed the Engine Start Battery, the ON/START/OFF switch, cleaned all the POS and NEG contacts. How do you check to see if the Starter Motor is working? Any ideas what to try next?

[donradcliffe]

Jump to small red wire on the starter solenoid to the big red wire. If the engine starts, you have a wiring problem. If it doesn't start, measure the voltage between the big red wire and a good ground while someone else jumps it. If it is over 10 volts, you have a starter problem.

[deblen]

Check the neg bat cable where it connects to engine.

[rdkinard]

Looks like we have a Starter Problem... Agree ??
Measured the signal voltage to the Starter Solenoid as 11.5v (on Battery alone) or 13.0v (on Battery Charger) and NOTHING!
Starter Battery voltage did drop 1v from 12.4v or 14.2v, respectively, while pressing the Start Button, without the Starter turning over.
Is there any way to determine if it's the Starter Solenoid or Starter Motor?
Thanks

[rdkinard]

Looks like we have a Starter Problem... Agree ??
Measured the signal voltage to the Starter Solenoid as 11.5v (on Battery alone) or 13.0v (on Battery Charger) and NOTHING!
Starter Battery voltage did drop 1v from 12.4v or 14.2v, respectively, while pressing the Start Button, without the Starter turning over.
Is there any way to determine if it's the Starter Solenoid or Starter Motor?
Thanks

[donradcliffe]

Before you take the starter off, make sure the engine CAN turn over by putting a big wrench on the front pulley.