4 pin verse 7 pin

[chorizon]

I'm planning on using a 7-pin, mainly because I want to be able to charge my trailer battery from my TV.
That is right, right?

[G-force]

Right. A & pin will have a 10 gauge ground and hot wire suitable for charging the trailer battery.

I'm planning on using a 7-pin, mainly because I want to be able to charge my trailer battery from my TV.
That is right, right?

[wlooper89]

My trailer came with a flat 4-pin running light plug and my tow car at the time already had a round-7 pin receptical. So I had to change something. A four to seven pin adapter would have been the easy way, but I converted the trailer to 7-pin and am glad I did. One of the extra wires charges my trailer battery when towing. Another could be used for trailer back up lights if I decide to add those. No electric trailer brakes, so for now I just use five of the wires. Another advantage of the 7-pin setup is that it has a locking device to hold the plug in the receptical.

Even if only the four running light wires are used initially, I think it would be good to have the 7-pin setup and the capability to easily add a battery charge wire later.

Bill