77 - 300 wiring help
77 - 300 wiring help
Looking for a good pic or guide for the main harness connections coming off the engine to the plug to the rest of the wiring. Sled is a '77 300 w/Kohler 295ax. None of the diagrams on the home page match up, sled does NOT have electric start, nor a CDI ignition. This is the white connector, looking for what goes to what on a working, running sled. Thanks.
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SpitfireKing
- Posts: 659
- Joined: Wed Apr 29, 2009 10:31 pm
- Location: Oak Lake, Manitoba
Re: 77 - 300 wiring help
http://vintagesnow.com/John_Deere.html
Did you try this site?
If you get desperate I have a 77 on the floor right now I could look into...what is the issue to start with?
Did you try this site?
If you get desperate I have a 77 on the floor right now I could look into...what is the issue to start with?
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Re: 77 - 300 wiring help
When I got the sled it would barely run with the Walbro on it. Some of the wires were pulled out of the connector and hanging loose. Working on getting a Mikuni conversion dialed in and had all kinds of funky electrical issues; Spark w/key off, kill switch only dropping one cyl, get it started and turning on the light switch would kill the motor. All the wiring diagrams I've found show a red and a white wire coming off the mag to the plug connection. I have 2 black wires 
After studying it for a bit and with some trial and error I think I've got it. The green and yellow wires are off the lighting coil ( diagram only shows yellow ) the others are ignition feed and ground. On the chassis side of the harness I have: 2 black wires on a single spade term, single brown, single brown w/white tracer, single white, and white w/black tracer. If you could check the 300 you have and let me know what goes where, Id appreciate it.
After studying it for a bit and with some trial and error I think I've got it. The green and yellow wires are off the lighting coil ( diagram only shows yellow ) the others are ignition feed and ground. On the chassis side of the harness I have: 2 black wires on a single spade term, single brown, single brown w/white tracer, single white, and white w/black tracer. If you could check the 300 you have and let me know what goes where, Id appreciate it.Re: 77 - 300 wiring help
Having spark on one side with key or kill switch off is a good one. Seen it a few times.
The cause is a poor coonection on one of the two ignition leads that are on the engine connector, one set of bad points or the wire treminal connection on the points.
Anytime some PSO messed with the wiring it is a fun project to sort it all out.
But remember on just about all two cylinder engines, regardless of brand or where they were made, there will be five wires.
Two for the lighting coil, two for the ignition (points) and a ground.
Sometimes there are only four as one lighting coil lead is grounded to the stator internally, thus using the common ground.
An OHM meter will help you figure it out. The lead with 0 ohms to the engine is ground.
The lead with say 1 ohm give or take a few tenths is the lighting coil. When you rotate the engine slowily by hand this will not change.
The two ignition leads will show a similar reading but will change as you slowly rotate the crank. At the spot where the points open the meter change.
It will do this on both leads but 180 deg apart.
As for the headlight switch shuting off the engine you will have to trace back the wiring to the point where the lighting curcuit has been hooked up to the ignition curcuit.
The only point that these two seperate curcuits share a common connection is at the stator and taht is only a ground.
The cause is a poor coonection on one of the two ignition leads that are on the engine connector, one set of bad points or the wire treminal connection on the points.
Anytime some PSO messed with the wiring it is a fun project to sort it all out.
But remember on just about all two cylinder engines, regardless of brand or where they were made, there will be five wires.
Two for the lighting coil, two for the ignition (points) and a ground.
Sometimes there are only four as one lighting coil lead is grounded to the stator internally, thus using the common ground.
An OHM meter will help you figure it out. The lead with 0 ohms to the engine is ground.
The lead with say 1 ohm give or take a few tenths is the lighting coil. When you rotate the engine slowily by hand this will not change.
The two ignition leads will show a similar reading but will change as you slowly rotate the crank. At the spot where the points open the meter change.
It will do this on both leads but 180 deg apart.
As for the headlight switch shuting off the engine you will have to trace back the wiring to the point where the lighting curcuit has been hooked up to the ignition curcuit.
The only point that these two seperate curcuits share a common connection is at the stator and taht is only a ground.
Todd Schrupp
Milbank SD
Milbank SD