50 f cub battery drain

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Jdbfish
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50 f cub battery drain

Postby Jdbfish » Mon Aug 31, 2015 4:15 pm

Have a 1950 cub, magneto, 6v positive ground system. Tractor fully restored 2 years back so everything is clean and corrosion free and wiring harness was installed brand new. Since restore the battery has always seemed to drain down slowly (about 2 weeks before needing a full manual charge) even though it gets driven 1-2 times a week for short periods. Sometimes it would need a jump start and always sparks when attaching cables. Is this a sign of something pulling a load on the battery? What could it be? What should charging output be from generator? How do u verify if Ginny is working? I'm scratching my head here, please help....

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Re: 50 f cub battery drain

Postby JDB44 » Mon Aug 31, 2015 8:17 pm

Could be a wiring problem. I had missed wired battery wire from regulator to the stop switch on my 55 cub recently even after resdingbthe directions from the harness supplier and the International wiring diagram. Could also be a problem with the regulator bleedingbthrough to generator.

Scrivet
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Re: 50 f cub battery drain

Postby Scrivet » Mon Aug 31, 2015 8:59 pm

Jdbfish wrote:..... Sometimes it would need a jump start and always sparks when attaching cables......
Sparks when attaching Jumper cables or sparks when attaching battery cables?

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Re: 50 f cub battery drain

Postby Eugene » Mon Aug 31, 2015 9:17 pm

Tractor not running. Disconnect one cable from battery. Multimeter, set on highest amp load, in series between empty battery post and disconnected battery cable.

At regulator, disconnect the wire on the B (battery) terminal. See if battery drain has terminated.

If not terminated move on to the light switch. Same procedure.

My first guess is that the cut out or cutout portion of the regulator is not disconnecting the generator from the battery.

Use multimeter to determine the voltage across battery terminals when engine running at 50% throttle. Charging voltage should around 7.5 volts - give or take a bit.
I have an excuse. CRS.

Jdbfish
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Re: 50 f cub battery drain

Postby Jdbfish » Mon Aug 31, 2015 10:16 pm

Guys I will check everything out now that I have some ideas on what to do (thanks Eugene!)

Jdb44 I will verify all the wiring and connections again and get someone else to also verify independently

Scrivet battery sparks slightly when cables connected and a lot when jumper cablesif the push pull shutoff switch on the dash is left on will that drain the battery?

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Don McCombs
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Re: 50 f cub battery drain

Postby Don McCombs » Mon Aug 31, 2015 10:37 pm

Jdbfish wrote:... if the push pull shutoff switch on the dash is left on will that drain the battery?

Absolutely... and may cause other damage, as well.
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Jdbfish
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Re: 50 f cub battery drain

Postby Jdbfish » Mon Aug 31, 2015 10:42 pm

Don McCombs wrote:
Jdbfish wrote:... if the push pull shutoff switch on the dash is left on will that drain the battery?

Absolutely... and may cause other damage, as well.


What kind of damage? And what causes it to drain the battery?

The carb leaks a bit when setting so we always run it out of gas to keep it from leaking and smelling bad inside so I've found the switch left on by accident several times

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Re: 50 f cub battery drain

Postby Eugene » Mon Aug 31, 2015 10:43 pm

Don McCombs has posted. As I read the original post, the push/pull switch is for the magneto.
Jdbfish wrote:if the push pull shutoff switch on the dash is left on will that drain the battery?
The push pull switch for the magneto is only a kill switch. The magneto is not battery powered.

No if the magneto has not been converted. Sometimes the magneto is converted to an external automotive style coil and is battery powered

If the magneto has been converted - then the answer is yes.
I have an excuse. CRS.

Jdbfish
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Re: 50 f cub battery drain

Postby Jdbfish » Mon Aug 31, 2015 10:59 pm

Oh ok good, magneto does not have external coil and is not battery powered. Did not think it would matter on switch being left on but thought I would throw it out there just in case!

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Don McCombs
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Re: 50 f cub battery drain

Postby Don McCombs » Tue Sep 01, 2015 11:12 am

Missed the magneto reference. My bad.
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Scrivet
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Re: 50 f cub battery drain

Postby Scrivet » Tue Sep 01, 2015 8:25 pm

If the battery cables are sparking when you hook them up then there is definitely an electrical load somewhere. Whether it's the headlights are on, a short inside the starter switch, or a regulator/cutout hanging up, to a million other possibilities. You'll just have to start isolating things. I'd start with Eugene's suggestions on where to start.


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