Wiring puzzle in 1980 C1100

[graywolf1939 27]

I have several wires on my WH 1980 C1100 that have me wondering where they go after an engine overhaul. I have included photos. The engine is an original Briggs 11HP. It uses a Magneto system (no points and coil).

I don't know where the white wire goes that is coming up behind the fly wheel behind the magneto. Then there are two (2) red wires exiting beneath the flywheel and go to what I think is the diode rectifier, the second red wire I believe is not used on the other side of the rectifier because my model was not purchased with headlights which would have used AC from the rectifier. Then there is the Black wire which is on the magneto via a push ON female connector and this runs to a ground screw on the front of the tractor; see 2nd photo.

[gwest_ca-(File Mod) 11,522]

Do you have the B&S service manual?

Some B&S wiring info

 

[graywolf1939 27]

I don't have the B&S manual, but my WH Owner's manual under section 9 - Engines lists the engine B&S number as 252417  Type 0198-01 

[953 nut 60,349]

This B&S Service Manual is listed for your model. Also this electrical service manual is listed for your model. The black wire (or any other wire) with a crimped end on it is NOT factory wiring and should be considered suspect.

 

[graywolf1939 27]

Thank you for your reply, as a vet also, thank you! I am still having a problem trying to find my exact wiring diagram. All the ones I see for the 1980 C series show a coil and points, I have a magneto, no coil or points.

My WH is a 1980 C1100 Special, I guess they didn't make many of the Special class!!

[gwest_ca-(File Mod) 11,522]

This manual has B&S models

 

[graywolf1939 27]

Thank you for your reply, I really appreciate the help, at age 86+ I am running short on finding answers. Here is my wiring diagram from my owner's manual, working all morning in sweltering heat and still cannot find out what the white wire is for.

 

I cannot understand why this engine ran with the black wire from the magneto connected to ground on the front of the engine, see photo. And I cannot find out what the WHITE wire is used for which comes up from behind the flywheel behind the magneto.

[gwest_ca-(File Mod) 11,522]

Where does the white wire come out?

The engine to tractor connection on the engine side of the connector there may be a diode covered with tape. Squeezing the tape you should feel the diode - 3/16" diameter x 3/8" long. That would be the charge wire for the battery.

The only other thing behind the flywheel is the stator and I don't know what one you have. How does the operator manual describe the charging system? Dual circuit? Tri circuit? Amps?

[gwest_ca-(File Mod) 11,522]

In one of your earlier photos the yellow tractor wire goes to the engine stator for AC power for lights.

The orange tractor wire should have the diode in it on the engine side of the plug together connector. Diode would be under the insulating sleeve.

 

See a black wire going to where the throttle cable is connected. That is usually a ground connection made when the throttle cable is pulled back to idle. The carb throttle linkage makes the connection.

The black wire with the blue insulated eyelet is not original. Does it connect to the above black wire?

[gwest_ca-(File Mod) 11,522]

Wonder if someone had a problem with the kill relay and replaced the ignition switch to one for magneto ignition?

This model uses a battery ignition switch to control the kill relay that controls the magneto ignition.

This is the original ignition switch. Click on the picture in the link and again on the thumbnails that come up.

 

[graywolf1939 27]

The white wire had been damaged years ago and black wire was added on and ring connector. The white wire can be seen exiting at top of stator in one of my photos. There are two red wires exiting the bottom of the engine and those two wires go to diode housed in a plastic casing that you can see in one of the photos. One of the red wires becomes a yellow wire after the diode and is not used because it was there to provide AC for lights which my tractor did not have. I also have a kill switch solanode.

[gwest_ca-(File Mod) 11,522]

If it runs fire it up and see if you have AC voltage at the black wire with blue insulated terminal.

The 1979 C-111 8-speed model 91-11B801 used the same engine and spec.

There is a 1979 C-111 Automatic model 91-11BS01 listed but no evidence it was ever made.

[graywolf1939 27]

I will fire it up as soon  as I get it back together, good suggestion, thank you mon ami.

[gwest_ca-(File Mod) 11,522]

Added some color to the wiring

 

[graywolf1939 27]

You nailed it, this is the exact model and wiring diagram right to the exact color of wires.  The only thing I still do not know is where the white wire is going to. I think you are correct in earlier comment, it comes from the stator and connects to the engine just under the carburetor linkage somewhere and acts as a shut off when the throttle lever is moved to OFF position, I just don't know where as it has broken off years ago I assume.

[gwest_ca-(File Mod) 11,522]

Here is the engine operator manual. There is a section on the remote throttle. It shows the stop switch and it may just be a spring clip to grab a bare wire. When the throttle goes to idle you may see it move. It may hold the wire on the back side of that control panel.

Do not allow any battery voltage into the mystery wire. If it is a kill wire for the coil, voltage will burn it up in an instant.

 

[graywolf1939 27]

The white wire has to be a stop/via grounding wire at the carburetor because the wire was/is too short to reach anywhere else. I will prove this out when I  get the engine running and then stop the engine by touching the white wire to gnd.

 

A big thank you for your help and patience.