Originally Posted by johnyoung39
I've tried to jump the 12V but I am not getting any dash lights to come on at all. Could there be a fuse that is preventing the power from reaching the control systems?
Originally Posted by Yinzer
I had to look up what a "Halo" is. Its claimed "57,720 mWH" (i.e. thousanth-of-a-watt-hour) of power is in more plain language, 57 watt-hour or a minuscule 4 1/2 amp hour at 12.5 volts. That can't begin to charge a completely dead car battery which can be 50 to 100 amp-hr.
Thanks, Zinzer for the info regarding the type of 'jump start' the 12-volt system needed. I thought that the small jump assist units out there, like the Halo I used, would do it, but no, they won't. So i followed your advice and jumped it from another car. That did it! Turns out I still had 65% in the main battery but drained the 12 volt. Even better news for me is that the 12-volt battery has come back to life and has not failed to hold a charge for 2 weeks now. Love this board!