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Success, battery charge line kit works

Thanks for the concept

Conclusion. Thanks everyone for the information provided. Your insights and ETrailer won the day. RM 156-25 "towed vehicle charge line kit" is now installed. Final challenge was the specific nut needed for the positive jump post. I eventually went with 5/16 18, which was very tight, but worked...

FYI. I just finished installing the RM 156-25 towed vehicle charge line kit. I went with making the charge line connection to the jump post (red cover).

Finding the correct size nut is driving me nuts! Neither M8 1.25 or 5/16 18 fit. Still buying various sized nuts/threads and returning what doesn't fit. I am looking for specifics please.

Got everything figured out except how to connect the charging wire to the jump post under the hood. From what I've read, the jump post is the point of attachment. However, right next to the jump post is another 12 v source to the battery. ??

I am interested in your response as well.

How did you connect the charge wire to the jump post under the hood.

Help...How did you attached the 14 gage wire to the "jump post" under the hood? I've tried 5/16 18 nut, M8 1.25, and neither one fits. Starts to thread then tighten's up.

Yes, would appreciate your insight on wiring the battery charge line to the Maverick. Specially where to connect the positive charge wire to the truck; on the jump start pole or the point just to the left if it (under black cover with do not jump graphic).

How did you connect the battery charging wire to the under hood positive jump pin? Size of nut?

How did you attach the hot wire to the under hood positive jump post? Size of nut?

Roadmaster battery charging for towed vehicles to include diode per review of E trailer website information and other recommendations for such a system.

Got it. I'll make the connection via the roadmster RM 156 25 battery charge kit and RM 690 diode. Hot pin from RM 6 pin plug already installed on front of truck to battery jump pin under the hood.

Ok on M8 nut. However, they come in various thread sizes such as 1.25, which is supposedly the nominal size. But there are 1.0, 0.8, and 1.5 sizes. What did the Ford guys specify?

Ok, M8 nut. However, they come in various thread dimensions such as 1.0 and 1.25. Which one? Yes, more information is appreciated.

Update. The 5/16 18 thread nut from Lows is too small, doesn't thread onto post/bolt.

No need, I've got it figuered out; thanks.

I've gathered a great deal of information that makes sense via this site, E-Trailer, and general searching and am convinced the battery charge line is essential (dead battery twice while towing as evidence needing one). I've orderd the RM 156 25 and their diode RM 690 for installation early next...