What I want to get it is a set of jumper cables with a switch in the middle of the cable, so that I can make the connections and then activate the cable while out of harm's way. If the center switch happened to have a voltmeter, fuse, and enough smarts to not allow a backwards connection then so much the better...
That's why your last connection is to the frame of the disabled vehicle, and you tap it first to make sure you've gotten it straight.
Why don't you just buy a spare 12v auto battery, store it in your trunk with some jumper cables, and take it out and recharge it with an inexpensive 120vac trickle charger every month or so?
That's what this is, in a compact, versatile package with a built-in test indicator, permanently attached cables, trouble light, and 12v cigarette lighter and USB sockets.
It will not only start my car when my battery's low, it'll provide an additional 12v power source in an emergency.
I just want to know for sure before I need it that it will do the job.
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