MountainAir05 wrote:
This is the standard, but does not mean they follow it. Running straight to the battery with out a fuse would be bad. I would use the build in wire set under the dash. If you are only going to use to tow a vehicle you really don't need the 7 blade unless you are going to charge the tow battery also.
https://www.etrailer.com/faq-wiring.aspx
SO Hows he going to use a brake controller with a 4 prong plug???
that's what the OP is posting about
A controller needs Ground,brake lite+ power feed,12V power supply
and a Blue wire from the controller back to the brakes
The 7 pole is because some want a charge wire and back up lites working on trailer besides the controller blue wire, tail and signals
and ground
SEVEN in total