Ford C-Max

tweetybird2 wrote:
Thank you all for your comments. Yes we do have the 12v line that we use, but that does not seem to help.

..Verify that you have, among all other wiring, the following:

1. Good ground connection between the MH and the C-max.

2. a 12V+ connection/wire, fused, going from the MH to your C-max's + batter terminal post. That is what a charge line is. Verify with a voltmeter that this line has 12 volts on it when MH engine is running, and that any fuses in the line aren't blown. Even though your battery is in the back, there is a + terminal/post under the hood used for jump starting that you can connect to for this.

..If you're finding your C-max's battery is dead after towing for a few hours, my bet is you're going to find that one of the two things I mentioned above either was not done, has a bad connection, or is not wired properly, somehow. If the charge line is wired/set up properly, your C-max battery will not deplete like that.

Ford doesn't seem to be too much of a help on this issue.

Yes, I too have found that Ford isn't a whole lot of help with this. They see this as not really their problem. In Ford's defense, though, I've pretty much got same response from ANY/EVERY auto dealer I've talked to about the subject of flat towing setup.

More than once, when we bring our Fusion hybrid in to the Ford dealer for service, the Ford techs ask me why I wired that charge line to the battery + terminal. When I explain to them what it is and why I did it, I get this dumbfounded 'oh, really, I never thought of or heard of that' type of look. :)