On Jun 4, 2:52�pm, dpb wrote:
OK, I'm stumped...

JD 112H lawn tractor (nearly ancient)

Symptom is no voltage in ignition system when turn key to "on/start".

Have had issue on occasion w/ safety interlock on tranny, but that ain't
the problem this time; have tested continuity from switch connection
thru both safety contacts (transmission and blade) to connection at
solenoid and is good. �Plus, when one of them fails to make contact,
won't crank but does get voltage to generator charge light; not getting
that far now.

Question -- is way to test if solenoid isn't operating might be issue?
Service manuals aren't online but here's a link to the parts diagram for
the wiring harness that is a fairly complete wiring layout.

http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view...

I scanned the wiring diagram I have; don't know how good it'll be but
there's a copy posted here...

http://photobucket.com/userinfo/reset/dpb_bucket/9d06ddac9fcf93eb81b6...

Any troubleshooting help/suggestions appreciated...

--

Knowing the engine type and model would help. Anyway, you should have
one wire coming from the magneto. This is nothing more than a kill
switch. Disconnect it. After disconnecting it, make sure it isn't
touching any metal. Then jump the solenoids 2 big wire lugs. This will
make the engine turn over and start (assuming there isn't other
issues). BUT! in order to stop it, you must ground that wire to the
engine/frame.

Hank