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Two Poll Ignition Switch No Power to Mag

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CubRepairMan
Posts: 15
Joined: Sat Jan 25, 2020 12:24 pm
Zip Code: L6Y1S5
Tractors Owned: 1948 Cub
1947 Farmall A
Culitvator Set for Both
194 Plow
53A Blade
Sickle Mower 5'
Location: Brampton, On

Two Poll Ignition Switch No Power to Mag

Postby CubRepairMan » Fri Apr 17, 2020 10:25 am

Good Day, to all.
Well this 48 6 volt Mag ignition is Stumping me into day two. Have reviewed the wiring for the 6 volt Mag and all wires connected. Power to all three lights. Power to starter ( - ).Ordered a new switch and received a two poll, not what I ordered. So, did the connections from mag to switch then to ground. On or off I don't get resistance.
I have followed all posts and have checked the following 5 times.
Timed to TDC and checked rotor to be one # 1 Spark plug out.
Valves not stuck
Spark at points and set at .013
Coil works restarted my heart
Checked plug wire firing order
Blue spark to the plugs
Gas in tank, going through carb, plugs are wet
As we know on here, everyone has a different problem,
Suggestions on this switch or a way to bypass the switch

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Eugene
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Re: Two Poll Ignition Switch No Power to Mag

Postby Eugene » Fri Apr 17, 2020 10:43 am

Does the tractor start/run when the ignition wire is disconnect from the side of magneto?
CubRepairMan wrote:On or off I don't get resistance.
With wire disconnected from magneto, check for continuity from disconnected magneto wire end to ground in both switch positions, on, off.
I have an excuse. CRS.

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Barnyard
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Re: Two Poll Ignition Switch No Power to Mag

Postby Barnyard » Fri Apr 17, 2020 11:07 am

With the two pole switch you have to have the switch in the OFF position to start the tractor and ON position to turn it off.
There are two ways to get enough Cubs. One is to continue to accumulate more and more. The other is to desire less.

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Jim Becker
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Re: Two Poll Ignition Switch No Power to Mag

Postby Jim Becker » Fri Apr 17, 2020 11:23 am

CubRepairMan wrote:. . .
Spark at points and set at .013
Coil works restarted my heart
. . .
Blue spark to the plugs
. . .
Suggestions on this switch or a way to bypass the switch

These symptoms don't track with "no power to mag".

First off, there shouldn't be any power TO the mag. Feeding battery power into it will do damage.

Your observation "Blue spark to the plugs" indicates the magneto is working. The only electrical parts that are likely to be in question are the spark plugs. Are they new or at least clean? Since they are wet, it seems you are also getting fuel. Most likely problems are either fouled spark plugs or you are flooding it. Clean and dry the plugs and use less choke.

CubRepairMan
Posts: 15
Joined: Sat Jan 25, 2020 12:24 pm
Zip Code: L6Y1S5
Tractors Owned: 1948 Cub
1947 Farmall A
Culitvator Set for Both
194 Plow
53A Blade
Sickle Mower 5'
Location: Brampton, On

Re: Two Poll Ignition Switch No Power to Mag

Postby CubRepairMan » Fri Apr 17, 2020 11:43 am

Staring to wonder it there something up with the terminal screw on the side of the mag. Your right there is no power to the mag. As a ground switch. Rebuilt carb. Might just have to get a new carb, Screw set at 1.5 turns out.
checked the new switch, just fine.
And Barnyard you're right. I thought I was nuts, but now that I thinking about this switch, I'm going to check the plug spark with the switch out of the dash. I'll get back to you all, Thanks

Eugene
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Re: Two Poll Ignition Switch No Power to Mag

Postby Eugene » Fri Apr 17, 2020 12:30 pm

Reread all of CubRepairMan's posts.

When was the last time you had the tractor running? Is this a no start situation after your restoration work?

Compression tests, dry then wet?
I have an excuse. CRS.

CubRepairMan
Posts: 15
Joined: Sat Jan 25, 2020 12:24 pm
Zip Code: L6Y1S5
Tractors Owned: 1948 Cub
1947 Farmall A
Culitvator Set for Both
194 Plow
53A Blade
Sickle Mower 5'
Location: Brampton, On

Re: Two Poll Ignition Switch No Power to Mag

Postby CubRepairMan » Fri Apr 17, 2020 6:08 pm

To Eugene,This tractor hasn't ran since 2007. Was under cover for all these years, but she needed a 4000 dollar make over. Axles to axles all new bearings, gasket , seals etc. Has taken me 15 months and about 900 hours.
So, worked on this all afternoon, We have solved the electrical issues. Recleaned the Zenith Carb, still nice and clean, checked again all check list.
My guess is faulty manifold gaskets, head gasket, doesn't seem to still be getting gas. Carb in tight with no over flow of gas or leaks.
Did a compression test after the rebuild at that time was 115. Going it again over the weekend. Have retorqued the head and manifold.
Thanks for all the help, there is always an answer to the problem, and I will find it.

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Glen
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Re: Two Poll Ignition Switch No Power to Mag

Postby Glen » Fri Apr 17, 2020 6:25 pm

Hi,
You could temporarily disconnect the ignition switch wire at the magneto, and see if it will run.

If you want a 1 post ignition switch, TM Tractor has them, their website is at the bottom of the page. :)
Last edited by Glen on Fri Apr 17, 2020 10:40 pm, edited 1 time in total.

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Barnyard
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Re: Two Poll Ignition Switch No Power to Mag

Postby Barnyard » Fri Apr 17, 2020 6:32 pm

Bruce, a two pole switch will work. You just have to connect one terminal to the side of the mag and the other termal to the dash or some other grounded source.
There are two ways to get enough Cubs. One is to continue to accumulate more and more. The other is to desire less.

Circle of Safety

Eugene
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Re: Two Poll Ignition Switch No Power to Mag

Postby Eugene » Fri Apr 17, 2020 8:42 pm

I'm assuming the magneto was off the tractor during the engine rebuild.

After the compression tests, double and triple check that the magneto is timed correctly to the engine and the magneto's rotor is timed to the pinion.

Magneto kill switch, wire as Barnyard Bill suggested, except upside down. On is up, an open connection to the magneto, tractor runs. Down closes the connection, grounds out the magneto and kills the tractor.
I have an excuse. CRS.

Waif
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Re: Two Poll Ignition Switch No Power to Mag

Postby Waif » Sun Apr 19, 2020 9:09 pm

Whatever you had the switch set up at that was giving you spark to the plugs is where I would mark it.

Then shut it off and revisit your timing.
IF an unmodified 48 , follow the manual for where to position the crank and rotor and mag before turning the mag away from the engine block till it clicks.

If you have already revisited that a couple times already , don't throw the hand crank at me....

Don't know why a friend gapped my plugs wrong on one Cub. But it didn't want to start worth a toot after...L.o.l.. It would try though.


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