Battery draw while flat towing

[Acfordguy]

First trip out towing the Mav with stay in play brake, received a message that battery was low?? When we arrived after about 2 1/2 hours it started ok. Thinking about installing a battery charge line while towing. Any advice and thanks in advance

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[swtiming8]

First trip out towing the Mav with stay in play brake, received a message that battery was low?? When we arrived after about 2 1/2 hours it started ok. Thinking about installing a battery charge line while towing. Any advice and thanks in advance

Yes charge line a must with flat tow

 

[Acfordguy]

Thanks

 

[realshelby]

Many RV's that have a 7 pin round connection will have a "battery charge" line as one of the circuits. I simply opened my 6 pin round connector on front of the Maverick and run a 14 gauge wire from the corresponding "battery charge" terminal to the jump post under the hood of the Maverick. I did use a diode inline as many "kits" sold use diodes. But....I am not sure that is required. Did NOT use a diode on my Cmax when flat towing it.
Anyway, your accessory port/cigarette light receptacle turns off after a while. That is why your brake system says battery low. Flat towing the Ford hybrids requires a battery charge wire as there IS a drain on the system over time. While you can tickle the 12v battery with a jump box and it takes right off, that is a hassle eliminated by a charge wire. Once installed, there is NO maintenance and no low battery issue.

 

[FlShark]

Yes charge line a must with flat tow

Yep, the installer for our tow plate had to install a battery charge line.

 

[cabhrp]

I decided that a charger would be better and had a RVI charger installed under the hood using the RVs charge line. So far working well.

 

[LAMavOwner]

What ground and 12V points under the hood did you use for the RVi Battery Charger? I need to install my battery charger and Wireless Breakaway switch in my 2024 Lariat.

 

[Mrk]

Many RV's that have a 7 pin round connection will have a "battery charge" line as one of the circuits. I simply opened my 6 pin round connector on front of the Maverick and run a 14 gauge wire from the corresponding "battery charge" terminal to the jump post under the hood of the Maverick. I did use a diode inline as many "kits" sold use diodes. But....I am not sure that is required. Did NOT use a diode on my Cmax when flat towing it.
Anyway, your accessory port/cigarette light receptacle turns off after a while. That is why your brake system says battery low. Flat towing the Ford hybrids requires a battery charge wire as there IS a drain on the system over time. While you can tickle the 12v battery with a jump box and it takes right off, that is a hassle eliminated by a charge wire. Once installed, there is NO maintenance and no low battery issue.

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.

 

[Mrk]

I decided that a charger would be better and had a RVI charger installed under the hood using the RVs charge line. So far working well.

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

 

[Mrk]

What ground and 12V points under the hood did you use for the RVi Battery Charger? I need to install my battery charger and Wireless Breakaway switch in my 2024 Lariat.

I am interested in your response as well.

 

[realshelby]

Simple. I removed about an inch of insulation on the wire, doubled the wire, bent it to a 90 degree angle, then used a very small hose clamp to hold it against the jump post.

 

[Mrk]

Thanks for the concept

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