The disconnect should be on the ground side of the battery and if you have pos. ground then you will have to find a suitable switch.(bigger terminal)which style do you folks use and do you install on pos grnd battery post? or not use at all. Tom.
I use a heavy duty rotary switch mounted on the floorboard under drivers seat. See file attached below.
Fastronix Solutions 2 Post High Current Master Battery Disconnect Switch with Face Plate https://www.amazon.com/dp/B011EYWMDS/?tag=atomicindus08-20
19Fordy did you mean attach to pos grnd post or the( -) post? I have 6volt pos grnd system.