And to echo what has been posted above, since this devise needs a lot of power (amps) a long run of wiring is difficult to get that kind of power sent to the jack motor as compared to a battery pugged in near by. The length of wiring may be an issue in your comparison.
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1966 Mercury Park Lane 4 DR Breezeway 410 4V, C-6, 2.80 - Streamless.
1966 Lincoln 4 door Convertible 462 4V 1971 Ford LTD Convertible 429 4V Phoenix ~ Yeah it's hot however it's a dry heat!
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