C-101 no spark and getting (MAD)

[rmaynard 15,434]

Do you have a multi-meter?

[WH nut 553]

Make sure red to red on PTO switch has 12v coming from switch, if not examine the switch. I assume you have 12v to the switch from the battery since it is cranking

[rmaynard 15,434]

Look at the ignition circuit on the wiring diagram. Then with the ignition switch in the run position, use your meter to start checking 12 volts from the (I) lug on the ignition switch to where you lose it. Once you have found where it is no longer there, you have found your problem.

 

I've added a picture without the bold lines on the ignition circuit so it's easier to see.

 

Edited February 4, 2014 by rmaynard

[dandan111 31]

Fuse?

[rmaynard 15,434]

Unless added by the owner, there is no fuse in the ignition circuit.

 

I think you have a bad crimp in one of the connectors.

[WH nut 553]

Look at the ignition circuit on the wiring diagram. Then with the ignition switch in the run position, use your meter to start checking 12 volts from the (I) lug on the ignition switch to where you lose it. Once you have found where it is no longer there, you have found your problem.

 

I've added a picture without the bold lines on the ignition circuit so it's easier to see.

 

c101wire.png

rmaynard, you highlighted the start circuit

 

He needs to follow the red off switch through PTO plug to ign coil.

Edited February 4, 2014 by WH nut

[rmaynard 15,434]

I added the picture without the ignition circuit in bold so it was easier to see the lines. The first picture that I added had the ignition circuit in bold and it was difficult to see the lines.

 

I decided to make it even easier. The ignition circuit is RED.

 

Edited February 4, 2014 by rmaynard

[WH nut 553]

I added the picture without the ignition circuit in bold so it was easier to see the lines. The first picture that I added had the ignition circuit in bold and it was difficult to see the lines.

Copy that, got ya now

[squonk 41,051]

Unless added by the owner, there is no fuse in the ignition circuit.

 

I think you have a bad crimp in one of the connectors.

No kidding! I found 3 fuses on Marvin being used as connectors! 

[WHEEL HORSE BILL 7]

Ok guys I finally figured it out.The guy who owned it had a wire going from the + off the coil directly to the key switch does that make sense. I saw the diagram and saw the same wire going from the coil to the pto clutch switch not the key switch.

[can whlvr 993]

he just bypassed the pto switch,so do you have power in that line when the key is on

[Save Old Iron 1,566]

Another way of looking at the wiring issues...

 

 

 

If the ignition switch "I" terminal is corroded or the connector that attaches to the "I" terminal is corroded, no power will reach the safety switches and in turn the igntion coil.

 

A temporary jumper from the battery (+) terminal to the ignition coil (+) teminal will supply the power needed to run the tractor in an emergency situation. To stop the engine, remove the new jumper wire from the battery (+) terminal.

[Save Old Iron 1,566]

You may also want to check the charge on your battery. I haven't read this thread in depth but charge current also flows thru the ignition switch. If the switch terminals are corr9oded, you could find yourself stranded in a snow bank if the battery is not charging properly.

[WHEEL HORSE BILL 7]

I bought it as is.Now I replaced everything point,condensor,coil,plug,rebuilt the carb just cause.I'm pretty much going thru the whole thing.If the motor runs well I want to save it Under my bench and put a 16 horse in this tractor with a 48" snow plow make it a beast with power.I also replaced the fuel line and filter.Now i'm not getting fuel to the carb.Looks like i might have to replace or rebuild the fuel pump.