Battery Lug Size

**ckramer1000** · 02-21-2021, 08:53 AM

Just took possession of a 2021 Reflection 31 MB and getting ready to install a true battery shut off switch. Need to confirm the lug size on the positive cable, and the rig is elsewhere. Can anyone confirm proper lug size for positive cable? 5/16? 3/8? Also, that the cables are 6 gauge? Thanks you will save me a trip!

**Second Chance** · 02-21-2021, 02:04 PM

Most automotive/marine/RV battery terminal bolts are 5/16". Cable gauge depends on the length of the run and the amp-hour rating of the system. I checked the GD parts lookup site for your rig and that cable isn't listed. You could give GD Customer Service a call tomorrow with your VIN.

Rob

**ckramer1000** · 02-21-2021, 02:32 PM

Cool, thanks. Thanks kind of what I thought. Alll I need for now. Much appreciated.

**Wicked ace** · 02-24-2021, 03:31 PM

The two deep cycle lead acid batteries I have 1/4" threaded and automotive cable posts. I got some 1/4" SS wing nuts awhile back I use to affix the cable lugs.

**Jerryr** · 02-24-2021, 04:22 PM

Originally Posted by ckramer1000

Just took possession of a 2021 Reflection 31 MB and getting ready to install a true battery shut off switch. Need to confirm the lug size on the positive cable, and the rig is elsewhere. Can anyone confirm proper lug size for positive cable? 5/16? 3/8? Also, that the cables are 6 gauge? Thanks you will save me a trip!

These are the cables I bought and the marine shut off switch I bought and installed on my 2017 Reflection 337RLS. 4AWG wires and the switch has Stud Size: 3/8" - 16.
https://www.amazon.com/gp/product/B07BXXNMBJ/

https://www.amazon.com/gp/product/B000MMC914/

There are less expensive shut oof switches but this one is a highly rated beast.

**FOWLERGK** · 02-26-2021, 12:34 PM

You can always buy 5/16 lugs and when you need a 3/8 lug. Just drill out the lug hole with a 3/8 drill bit.

Gary

**huntindog** · 02-26-2021, 12:47 PM

Originally Posted by FOWLERGK

You can always buy 5/16 lugs and when you need a 3/8 lug. Just drill out the lug hole with a 3/8 drill bit.

Gary

Be careful on this "fix"
It can reduce the amperage the lug can handle. IOW, I would only do this as a temporary fix until the proper lug can be obtained, and know that the amp load needs to be reduced until then.