Thank you for all the work. It is very timely for me, as I've just re-assembled my 51 cub, and cannot get it to start. It was running perfect before the tear down, and while apart, I repaird the wiring harness. A few of the wires were bare, just the two running up to the generator, and the one from the coil to the distributor, so I made up new ones for those. One at a time, so nothing was changed. Also the headlight wires were shot, so I made up a new harness for them as well.
The wiring harness was not too bad, so I removed the outer brade, and shrink wrapped the whole thing, and it turned out nice.
Again, the wires that were taken loose at the voltage regulator, I tried to mark and replace where they were to go, but in the middle of it I realized a tag fell off and I lost track of the Bat and L wire for the regulator. I'm farily certain I got it back correctly, but we'll move on for now. Below is a pic of the wiring harness:
So, I got her all back to gether, and she looks beautiful. Hooked up the battery, turned on the gas, and she cranks and cranks, but no start. Did a bunch of troubleshooting today, and I'm not getting any fire to the distributer. With the cap and rotor (plate) removed, I do not have any spark at the breaker points.
Did some more troubleshooting, and here's where things get odd.
This is a 1951, original wiring harness, 6-volt, + ground,
Headlights work with the push/pull iginition switch in or out. - unsure if ok
Starter cranks fine - ok
Continuity from batt wire on regulator to starter - ok
Ammeter shows slight discharge when headlights are on or try to start - ok
No continuity from L terminal wire on regulator to on/off switch - ???
Continuity from on/off switch to Coil - ok
Continuity from coil to distributor - ok
On/off switch shows continuity while pulled out and when pushed in - ???
My big question now is - how can the headlights work if the L wire has no continuity back to the on/off switch? Also, why do I have continuity across the on/off switch regardless if it's on or off?
I did find that I did in-fact have the batt and L wires reversed on the voltage regulator, and have corrected this. However, I have the exact same conditions as before I corrected it (as noted above).
At this point I'm thinking that the L wire must have broken at some point in time and someone has jumpered it behind the dash in order to get power to the lights. I did not have the dash off when working on the tractor, as everything was working fine, so I figured there was no reason to mess with it. I did move the wiring harness around A LOT! while working on it, so it's increadibly possible that I pulled some thing loose in there.
I think I'm going to pull the dash loose and see if I can move it out enough to get a hand in behind it and see what is up. I'm hoping to not have to pull the hood again, since I just put it all back together, but that's probably going to happen isn't it.
I'm open to suggestions. Based on the L wire issue however, and power to the headlights, I'm still not certain why I have no spark at the distributer?
Here is a picture with the hood on it, but unfortunately, it may be coming back off to work on the wiring: