Join Date: Nov 2000
Location: Manitoba, Canada
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Re: CJ: quick ? - battery disconnect switch
Good question. I do know that the battery terminal disconnect I bought was made to be installed on the ground terminal. I believe yuo are talking about a different style of disconnect, a real switch, like NHRA requires. I really like the ability to kill power with the spin of a knob when I am working on the engine or wiring. It has a blade style fuse bridged accross it, in order that you may limit power to the fuse capacity, in order that you may keep the clock or other essential running, but disable the starter or other large current draw that will blow the fuse. I of course pull hte fuse as well if I am working on wiring. No point blowing a fuse. Easy to reset the clock.
Either ground or positive should acheive the results you want. When working on a vehicle they tell you to disconnect ground (first). I assume that's because ground is prevalently exposed and uninsulated. Little risk of a wrench on the ground terminal coming to harm unless it touches the other post.
I'd connect your switch as close to the battery as possible. But is there an advantage in disconnecting ground instead of positive? Would this scenario be reversed on a British car with the chassis positive??? Hope to hear some learned thoughts on this subject. I apologize if I've wasted your time with my reply.