Ranger RCI-6900F TB power wires

[bobhere]

I have the small plug that goes into the rear of the unit. it has 2 leads coming off I got this unit used and someone has replaced the wires with 2 red leads can anyone help me and tell me which lead is negative and which one is positive please. Also if you know what the other 2 pins in that plug are that would be good info to have on hand.. Hey Thanks in advance you guys and gals on this board are top notch..
I have a link here to show the plug about half way down page it says
"The RCI-6900F TB Rear Panel"
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['Doc]

Just from looking at the picture, and by the (+/-) markings above that jack, I'd have to guess that the pins to the left are (+) and the pins to the right are (-). BUT! That's just a guess! I think I'd try checking things with an ohm meter, power turned on/off, to see if there's any differences. The (-) pin should be the same no matter if the radio is on/off. The (+) pin should change resistance with on/off. Again, that's just a guess so don't put much faith in it at all!
- 'Doc

[bobhere]

I figured that was the case with the + - but what gets me is the are 4 pins there 2 on top 2 on bottom