212-H lost spark ONAN 12.5 hp

[Terry T 1]

dead in the lawn

got air..got gas..no got spark

tested coil--13k ohms

what's next?

HELP

P.S. wife's tractor

 

[gwest_ca-(File Mod) 11,393]

Have you tried to disconnect the ignition wire in case one of the safety features on the tractor has failed?

Engine service manual help?

Garry

[Tractorhead 9,198]

The 212 Series has 2 Safety Switches on

one the Seat that acts if engine is running and mowerdeck is engaged,

anotherone that is at neutral for Start the Engine.

 

both go on relay‘s they interconnected as safety logic.

maybe one of the relay coils is done.

 

Check with neutral setting with you on the Seat by switch ignition on ( no start) you must hear a Realy clicking,

if you now engage the Electric Clutch, you hear the other relay acting if you stand up from the seat.

 

that is a simple proof without needed measurement tools.

if that seems working, check the fuses, on mine there was 2 Fuses in, a 5Amp for the ignition relay and a 15Amp for the 

Electronic Clutch. Both must be intact to fire up the Engine, because they handle also the Relay‘s.

If you don‘t hear a Relay switching, on mine both relay‘s on passenger side behind the lower black hood,

close to the Steering Shaft.

 

Both are Standart automotive changeover relay‘s.

 

Another issue i found on mine was a rotten Pin on the PTO Switch.

i grinded a bit to clean it up, put a little Vaseline on it and since it works like the first Day.

 

I hope that helps you

 

 

 

[Terry T 1]

the engine cranks just fine, so I do not believe it is the switches 

[gwest_ca-(File Mod) 11,393]

The starter and ignition are two separate circuits.

You need to disconnect the dark blue wire at the engine and see if the spark returns. You can waste a lot of time and money guessing where the problem is.

 

Garry

[gwest_ca-(File Mod) 11,393]

Added a 2nd corrected wiring diagram above hoping they would end up side by side.

 

First off I think I used the wrong ignition switch in the first  illustration. In 1990 the 212-H used B&S, Kawasaki and Onan engines but they do not all use the same switch. Only an original parts list will tell us and we do not have one.

 

The Accessory circuit was powered by the main circuit through a 15 amp fuse. The ignition switch Accessory terminal powers the 15 amp fuse. (Top left corner)

 

The start relay was not illustrated correctly.

 

Garry