Stud sizes in 7 pin connector junction box?

Maple_Geek · November 2022

Hello, I've been trying to find this information everywhere and keep coming up empty.
I bought an Autowbrake brake controller and I want to start getting it ready this winter by installing ring crimp connectors on the end of the wires.
The only information I'm missing is, what are the sizes of the studs in the 7 pin connector junction box? Does anyone know? Looks like 1/4" to me and I'm assuming that's pretty standard.

See picture below to see what I'm looking for. Thanks!

Image: https://us.v-cdn.net/5021717/uploads/editor/ta/mtgsc8k8i9ir.jpg

tybladesmith · November 2022

The nut is sized at SAE #10/32 threads. Hope this helps.

Maple_Geek · November 2022

tybladesmith said:

The nut is sized at SAE #10/32 threads. Hope this helps.

Thanks but what doesn't it mean in terms of ring connector size? 1/4"? 3/8"?

Horigan · November 2022

Below a 1/4" nut sizes switch to numbers, starting at #12 and going down from there for smaller sizes. So the stud size is #10 with 32 threads per inch. You'll find them in hardware stores.

https://www.boltdepot.com/fastener-information/printable-tools/US-Nut-Size-Chart.pdf

Maple_Geek · November 2022

Thanks @Horigan. I'm not looking for a nut size. I'm looking for the size of crimp on ring connector I should be ordering. Sorry if I wasn't clear. I think 1/4" will do.

Image: https://us.v-cdn.net/5021717/uploads/editor/7x/8g21si1fd0sr.jpg

Denny16 · November 2022

First, you need to know the wire SAE size for the cable you are going to terminate (Autobrake cable wires), which is typically 8 or 10, or a combo of the two, then you need to get a crimp on ring connector that fits a No 10 stud, typically these connectors will have a blue or yellow insulator on them )see your photo). Here is a chart showing the choices for a no 10 stud:
https://www.mcmaster.com/crimp-lugs/insulated-ring-terminals/for-screw-size~no-10/

A one quarter inch ring would be too big.
cheers

tybladesmith · November 2022

@Maple_Geek, A ring terminal for a #10 stud would be 3/16" inside diameter - 0.190" or bigger.

geoB · July 2024

I'm about to get an Autowbrake unit for my 400. I'm curious - how did you deal with replacing the cord (with its 7-pin female connector) with the bare wires of the Autowbrake? There needs to be some way to weatherproof the passage into the junction box.

elbolillo · July 2024

geoB said:

I'm about to get an Autowbrake unit for my 400. I'm curious - how did you deal with replacing the cord (with its 7-pin female connector) with the bare wires of the Autowbrake? There needs to be some way to weatherproof the passage into the junction box.

The wire from the Autowbrake get connected directly into the junction box mounted on the frame. A waterproof grommet can be used for the hole where the wire from the Autowbrake enters.

Stud sizes in 7 pin connector junction box?

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