I have two 12v batteries, but there is only 1 ground cable. I will install my switch in that ground cable when I get a switch. Well, actually I will then have two, shorter, ground cables with the switch between them.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.