Blowing Starter Safety Fuse Help Please

[31ASlant]

Any help would be much appreciated.
I’m working on a 30 Tudor
All stock. I have installed a tested generator and
Cutout. When I hook the battery cable up,
The generator cutout immediately closes the points
And since the vehicle isn’t running or ignition on,
It blows the safety fuse.
So basically it’s trying to motor the generator while everything is off.
Now if I attach the cutout without the 2 little screws on the generator body
It all works.
All I can think of is something off the harness from the coil and starter side is
Has power when it touches the batt connection on the cutout top.

[Bob C]

Almost sound like you have the cutout installed backwards.

[31ASlant]

Here’s a picture. If it helps.

[mercman from oz]

Here’s a picture. If it helps. 31ASlant

[nkaminar]

Is the cutout for an opposite polarity system? Do you have a positive ground or negative ground?

[31ASlant]

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Positive ground all stock

[31ASlant]

I’m not sure about the cutout itself. I’m assuming it’s positive ground.
I don’t know if they made them another way

[Gary WA]

Originally Posted by 31ASlant

Any help would be much appreciated.
I’m working on a 30 Tudor
All stock. I have installed a tested generator and
Cutout. When I hook the battery cable up,
The generator cutout immediately closes the points
And since the vehicle isn’t running or ignition on,
It blows the safety fuse.
So basically it’s trying to motor the generator while everything is off.
Now if I attach the cutout without the 2 little screws on the generator body
It all works.
All I can think of is something off the harness from the coil and starter side is
Has power when it touches the batt connection on the cutout top.

you need a nylon or non-conducting washer between the cutout and two yellow wires.should not touch cutout.

[Gary WA]

Originally Posted by 31ASlant

Here’s a picture. If it helps.

move the two yellow wires on the other side of red washer so not touching the cutout case.put the cover back on

[Benson]

Originally Posted by 31ASlant

Any help would be much appreciated.
I’m working on a 30 Tudor
All stock. I have installed a tested generator and
Cutout. When I hook the battery cable up,
The generator cutout immediately closes the points
And since the vehicle isn’t running or ignition on,
It blows the safety fuse.
So basically it’s trying to motor the generator while everything is off.
Now if I attach the cutout without the 2 little screws on the generator body
It all works.
All I can think of is something off the harness from the coil and starter side is
Has power when it touches the batt connection on the cutout top.

.
.
.

Maybe one of the small screws that mounts the cutout, is TOO long and is shorting one of the field coil wires.

[Benson]

Here is photo of what Gary WA is referring to>>>

Square part keeps washer in place and prevents shorts to the case cover.

Square part also centers the cover so the screw does not short on cover.

Photo from Berts website: www.modelastore.com

A-10563 GENERATOR CUTOUT INSULATORS- SET OF 2

[31ASlant]

Ok now I understand. So I’m basically putting 6 volts to the case of the cutout.
Is that why I’m burning fuses?
Thank you

[Gary WA]

Originally Posted by 31aslant

ok now i understand. So i’m basically putting 6 volts to the case of the cutout.
Is that why i’m burning fuses?
Thank you

yes

[ndnchf]

Its the wrong cutout, its backwards and missing the proper insulators. I rebuild generators and refurbish original cutouts. I can provide you with a correct cutout. PM me if interested.
Steve

[Gary WA]

Originally Posted by ndnchf

Its the wrong cutout, its backwards and missing the proper insulators. I rebuild generators and refurbish original cutouts. I can provide you with a correct cutout. PM me if interested.
Steve

Looks ok to me why is it backwards?

[ndnchf]

Originally Posted by Gary WA

Looks ok to me why is it backwards?

The cutout's two feet are always closest to the input side of the cutout and the generator output stud.

[Badpuppy]

ndnchf is correct. The battery closes the points and connects it to the generator (motor), which blows the fuse.

Question is, where did that generator case come from. Looks like you need to drill and tap new mounting holes. (Careful of the field windings.)

[Kurt in NJ]

That’s a later generator that style just had 2 wires coming out of a grommet instead of the threaded post one for power out, the other is field ground or attached to the oval cutout.
That style reproduction cutout usually has burned up contacts or melted solder where the winding connects.
Turn the cutout around and make a short wire to connect it.

[Badpuppy]

Originally Posted by Kurt in NJ

Turn the cutout around and make a short wire to connect it.

Ther ya go.

[Gary WA]

Originally Posted by ndnchf

The cutout's two feet are always closest to the input side of the cutout and the generator output stud.

Thanks

[ndnchf]

I include this with every refurbished cutout I sell.

[jrelliott]

BTW the cut outs are no polarity sensitive.

[Canton_Model_A's]

haha, when not driving our Model 'A''s we can always use the starter wire to do some Arc Welding

[ndnchf]

Unfortunately, that generator had been modified and pieced together. The cutout mounting holes are positioned for a pulley end terminal post. Somebody drilled the brush end and moved the terminal post to that end. The cutout is mounted backwards because that is the only way it can reach the new terminal post. But that lets the battery discharge back through the generator. Here is a photo of two generator bodies each with the terminal post at opposite ends. The cutout mounting hole positions are clearly different.

[Benson]

"And now here is "The Rest Of The Story" .....

Paul Harvey

[Kurt in NJ]

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The brush end of the field housing has a taper as does the end plate like the 33-34 type of generator., usually the front is also die cast aluminum or unknown similar metal for the 33-34 type, in rebuilding parts get mixed

[31ASlant]

Thank you for all the replies. I’m going to try and turn it around, plus insulate the cutout.
I’ll post when I get it sorted.

[ndnchf]

If you turn it around, you'll need to rig a wire from the terminal post to the cutout input. The L bracket wont reach. Brattons, Snyders etc sell the correct terminal insulators. Also, look closely into the cutout terminal holes. There needs to be paper insulators between the cover and terminals inside the cutout. These prevent the cover from shorting on the cutout.

If you want to learn more about cutouts, how they work and how to service them, check out my youtube video.

https://youtu.be/rnuukBeJ6Zs?si=pwI0egSMZO_jC6KP