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Old 06-25-2011, 08:47 PM   #1
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6 Pin 7 Pin

My Bounder has both a 6 pin connector and a 7 pin connector which is great for all applications except my Stehl dolly which is a 4 pin.

I'm assuming it makes no difference on whether to use a 4-6 adapter or a 4-7 adapter...is that right?

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Old 06-25-2011, 08:51 PM   #2
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Should not. The 7th pin as I remember is for battery charge only.

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Old 06-25-2011, 08:52 PM   #3
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I've never seen a 6 pin, but have used the 7 to 4 pin. They're pretty cheap.
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Old 06-26-2011, 06:26 AM   #4
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Most auto or trailer shops will have a 7 pin to 4 pin adapter plug.
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Old 06-26-2011, 06:34 AM   #5
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I'd go for a 7-to-4 adapter as the pin out convention on the 7-pin connector is much more consistent since it's used by vehicle and RV OEMs. That isn't the case, unfortunately, with the 6-pin connector where trailer brake and battery charge wires are frequently interchanged on the pin-outs - this manifests itself as locked trailer brakes when one attempts to pull out after hitching up. The problem is so prevalent that there are 7-to-6 adapters that have toggle switches to swap these wires internally!

I believe the "missing wire" in the 6-pin connector is the auxiliary center pin in the 7-pin Pollak connector that's normally used for back-up lights.

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Old 06-26-2011, 06:41 AM   #6
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Rusty is correct. The 7's have backup lights. It is also sometimes used to disengage a surge brake so you can back them up.

Either one will work. The adapters for 7->4 are much more common and relatively cheap.
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Old 06-26-2011, 07:44 AM   #7
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Thanks everyone...7 it is.
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Old 06-26-2011, 05:56 PM   #8
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The pins not in any particular order

Ground (the odd pin on the flat 4 is ground)
Tail/marker lights
Right stop/turn *
Left stop/turn *
Battery charge **
Back up lights/aux **

* On a flat 4, the tail/marker is next to the ground, the right and leaft, I'm nto sure the order.

** I am not sure which of these is on the six pin, but the difference between a six and a seven is the other one.

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