One trick is to use a palindromic connector as opposed to a polarized one.
For example if you were using 2 lines, use a 3 pin connector - + -
if the center pin is 5v and both outer ones are Gnd. it does not matter if you reverse the connector, also only one of the grounds has to be connected at one end.

KF4HAZ - Lonnie

----- From: "Bob Axtell" <engineer@

> But CHOOSING the connector is normally based on what your
> production facility's has in the way of CRIMPING tools. Hand crimping
> tools rarely make good connections; you want a connector that you can
> crimp with air or hydraulic tools. Making the wrong choice here can
> cause a production nightmare for your client.
> 
> HINT: All Electronics sells already-crimped 2, 3, 4 and 5-pin plugin
> polarized connectors, with color-coded wires AND the PCB male
> mates at a very reasonable price. Useable in small production runs.
> 
> --Bob 
> 
> PicDude wrote:
> 
> >Hi all,
> >
> >Been looking thru the Digikey and Mouser catalogs for a connector, but it's 
> >difficult to get a clear feel for what the connectors actually look/work 
> >like.  Hoping some one here might help me cut thru the chase...
> >
> >What I need is a simple 2-circuit connector for supplying 5V power (only a 
> >couple hundred mA) from one PCB to another.  I'm imagining a 2-post header 
> >soldered to the PCB, and a matching plug-in polarized connector.  The plug-in 
> >connector will have wires attached to it.  The connector must lock in place, 
> >since I'll be using this in a car.  And of course low-cost is better.
> >
> >I'm thinking that a floppy-drive power connector would be ideal (but a 
> >2-circuit version), but can't find this in the catalogs.  Any of you have a 
> >recommendation for this?
> >
> >Thanks,
> >-Neil.

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