Posted by Tom Fleming on February 16, 2015 at 05:42:05 from (67.20.239.72):
In Reply to: Is it possible posted by Dieselrider on February 16, 2015 at 04:51:10:
well, I have done it. Not the optimal situation. I don't recommend it, but in a pinch, a number of us have jumped a 6v system with 12 volts.
The positive vs. negative ground is just reversed polarity. so, the positive leg (terminal) is connected to the frame. As long as positive goes to positive, and negative goes to negative, that is all that matters.
There are horror stories around using 12v to jump a 6v system. I personally have never experienced it, but others will share their comments. After getting the polarity correct (red to red, + to +, etc), the main thing is, the only thing you should do is start it. do NOT turn on the lights, etc. I do NOT hook the jumpers up to the battery. I hook the positive to the frame, and then use the negative cable on the starter post. This is best if you have a magneto (which I prefer). Battery ignition will fail after you remove the jumpers if the battery is totally dead, and the charging system is not working properly.
The best route is to invest in a good 6v charger, one with a starting cycle setting on it.
disclaimer: my comments are to be used at your own risk. I have been working on mechanical things for almost 50 years now. there are things I do in a pinch that are not for first timers or the faint of heart.
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