Decided to connect my 2.0 amp Schumacher maintainer to my recently acquired 2013 Chevy Avalanche. The cable ends have a connection I’m not familiar with. When I loosened the nut to connect the ring terminals the nut won’t come all the way off the threads and only loosens the terminal to the battery post, like it’s a captured nut. I didn’t want to put too much pressure on the nut and risk mangling it up. There are enough threads on cable post connections to add the ring terminals but if the existing nut won’t come off I doubt if a second nut will go on to secure the ring terminals. Hopefully the pics will better explain my conundrum.
Odd ( to me ) battery cables and connecting maintainer ring terminal’s
- Thread starter gman2304
- Start date
Neat! 
The ring terminals are way too small for that stud.
f355spider
$50 Site Donor 2026
You can see the staking in the center of both the positive and negative bolts. It was center punched with a chisel or something to flare the threads on the bolt and keep the nut from coming off easily. I'd just force them off by keep turning with my ratchet...but that's just me. 
Leave it to GM to engineer an overly complicated arrangement for tightening battery posts. I'd need to get a good look at that thing first before I decided exactly how to handle it. I don't recommend forcing it off, they put a lot of effort into that to be just a simple nut.
Exactly and that’s what I ended up doing. I loosened each 1/2 turn then tighten 1/2 turn and repeated this about 6 times. Both nuts came off and went back on easily. I actually had enough threads to mount the ring terminals and piggy backed another stainless steel nut on top of each post and along with a bit of dielectric grease, hooked my old 2 amp Schumacher up and it’s now charging as it should.You can see the staking in the center of both the positive and negative bolts. It was center punched with a chisel or something to flare the threads on the bolt and keep the nut from coming off easily. I'd just force them off by keep turning with my ratchet...but that's just me.
Schumacher had a reputation for putting out a high voltage. Have you measured your voltage?
