48 Cub electrical question

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Don B.
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48 Cub electrical question

Postby Don B. » Sun May 07, 2017 8:54 pm

So I put a battery in my 48 this weekend. When I connected the cables, I got a spark and the ammeter showed discharge. Switch was off. Disconnected the wire from the switch and same result.
All wiring harness new from brillman. Seems like it's on correct.
It's 6 volt with magneto.
What is happening?
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Re: 48 Cub electrical question

Postby Eugene » Sun May 07, 2017 9:04 pm

Disconnect the small wire from the terminal on top of the starter. Tighten down the nut on the larger wire, still connected to the starter.

One battery cable connected to the battery, touch the other battery cable to the other terminal. If you still get a spark, the problem is most likely the starter switch.

No spark, reconnect the smaller wire to the starter. Remove the wire on the B (battery) terminal on the regulator/cutout. Battery touch again. If you get a spark, problem is some place in the wiring harness.
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Re: 48 Cub electrical question

Postby Crimson Tim » Sun May 07, 2017 9:15 pm

Did you put the battery in and hook it up as positive ground or negative ground? A '48 would originally have been positive ground. That yours is still 6V with a mag makes it most likely still positive ground.

You mention all new wiring harness. Is this the first time the wiring harness has had a battery installed, or have you used it successfully before the new battery? If the first time, double check wiring connections against wiring diagram applicable to your Cub.

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Re: 48 Cub electrical question

Postby Don B. » Mon May 08, 2017 7:00 am

Eugene- I will try that as soon as I can. Thanks.
Crimson Tim- It is hooked up positive ground. This is the first time I've put a battery in it since I've gotten it reassembled. Brillmans wiring instructions were pretty good. Seems to match up with the wiring diagram. That's not to say I didn't miss something. I will recheck it. Thanks.
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Re: 48 Cub electrical question

Postby Gary Dotson » Mon May 08, 2017 7:02 am

Do as Eugene suggested. My guess is probably a stuck voltage regulator contact.

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Don B.
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Re: 48 Cub electrical question

Postby Don B. » Mon May 08, 2017 7:41 am

Gary- I did not mention that I actually have a new cutout from Brillman as well. https://brillman.com/product/universal-cutout-relay/
As folks have mentioned, there's alway a chance that a new electrical item could be bad, though? Thanks.
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Re: 48 Cub electrical question

Postby Bigdog » Mon May 08, 2017 11:26 am

Re-check all your connections. It is possible to create an inadvertent short to ground even if the wires are in the correct location. I agree with the opinions above - most likely spots are in the cutout / regulator or starter switch. Disconnect wires one at a time until the sparking goes away and then follow that line to the source of your problem.
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Re: 48 Cub electrical question

Postby JohnMihevic » Mon May 08, 2017 12:42 pm

Don B. wrote:Gary- I did not mention that I actually have a new cutout from Brillman as well. https://brillman.com/product/universal-cutout-relay/
As folks have mentioned, there's alway a chance that a new electrical item could be bad, though? Thanks.


Was your old cut out relay bad? I have a 1948 Cub Ser. No. 11612 with the 3 brush generator and cut out relay. It is still original and works flawless. This cut out is just a simple on/off relay that not much can go wrong (like in a voltage regulator). The cut out won't control the battery charge like a voltage regulator is supposed to, but I have had no problems. My high charge is about 9 amps and low charge is about 4 amps. This is perfect for me. I have never overcharged my battery at 4 amps, The big plus is that it works.

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Don B.
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Re: 48 Cub electrical question

Postby Don B. » Mon May 08, 2017 12:45 pm

John- I got the this tractor in pieces and the voltage regulator appeared somewhat questionable so, for $20, I hoped to take that out of the equation.
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Don B.
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Re: 48 Cub electrical question

Postby Don B. » Sat May 13, 2017 9:38 am

Ok. So I tried what Eugene suggested. Disconnected small wire at starter switch and no spark at battery. Reconnected then disconnected + wire on cutout. No spark at battery.
Now what does that tell me?
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Re: 48 Cub electrical question

Postby Eugene » Sat May 13, 2017 10:53 am

There are two appliances after the disconnection at the cutout. They are the cutout and generator. Since the cutout has to be open when the engine is not running and the battery voltage is higher than the generator (generator not working in this test).

Cutout fault.

Before you purchase parts, have the generator tested.
I have an excuse. CRS.

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Don B.
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Re: 48 Cub electrical question

Postby Don B. » Sat May 13, 2017 11:18 am

I have had the generator tested and was told it was good.
So new cutout must be bad?
Thanks.
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Re: 48 Cub electrical question

Postby Eugene » Sat May 13, 2017 11:58 am

Double check that cutout it is wired correctly - not backwards. Also polish up the area beneath the cutout - ground.
I have an excuse. CRS.

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Don B.
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Re: 48 Cub electrical question

Postby Don B. » Sat May 13, 2017 4:10 pm

Haha! Swapped the wires on the cutout and we're good.
Thanks!
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