I just finished re-wiring (towing wires anyway, house 12v system still needs work) our new to us verry old Boler
. I put a 7 pin & a 4 pin pigtail on it out of a breakout box. No brakes
on it, but they will happen if we keep it & do the needed axle
replacement. I figure the 7 pin is worth it just for the 12v power & the flexibility. This way anybody can tow it no mater what they have. My Tacoma has a 7 pin & brake controller. The wife's Escape
only has a 4 pin, but I have something that looks like the above photo sitting on a shelf in my shop waiting to be installed as well. May or may not ever wire up brake controller stuff, but definitely will get 12v to a 7 pin socket on her Escape
at some point.
Running something from the lighter outlet is ghetto, it will probably work. You might pop fuses though if the battery is low enough to pull higher amps. A safer way would be jumper cables or something heavier gauge directly between the batteries. Wiring up a 7 pin would be best though.
All of those options could drain your car battery though, if left hooked up while its not running.
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