Help from 6000/D owners with Battery connections

Gidday!  Could use your help.  I'm trying to repair a Coinmaster 6000/D unit for an owner.
I have already had a schematic from member Gold Digger (Thanks again).
The owner told me that someone else had a look at it last year and I am suspicious that the battery wiring is soldered to the wrong PCB edge connector contacts.
So, with both packs (12 and 9v) connected, the meter only responds to the 12v battery test.  When the 9volt test is selected, the meter moves in the negative direction. (wrong!)
If I disconnect the 9 volt pack and try again, exactly the same thing happens.
I need an owner to describe what he sees as the correct connection on a known working unit.
I have removed 9 screws, removed the battery tray and have the detector 'upside down' with a clear view of the solder side of the printed circuit board. (see photo attached).
The 2 battery snaps are wired to (and soldered) to a PCB edge connector on the LHS (in this upside-down view)
There are 6 solder points on this upper-side and a complementary 6 points directly underneath (on the component side of the PCB). If we say that left-to-right is points 1 to 6 then
My black "9volt" Battery snap has it's red/black positive wire soldered to the point 1 on the underside but it's negative black wire to the upper-side on point 4.
My White "12volt" Battery snap has it's red/black positive wire soldered to the point 2 on the underside but it's negative black wire to the upper-side on point 3.
The 2 negative wires are, consequently, joined together by the PCB .  This does not seem correct when studying the schematic.  Your help would be appreciated.
Regards, Jimbo.


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Well I don't think the 12 volt pack would have given a positive (correct) deflection on the 12v battery check if it were reversed.
I am very concerned that reverse polarity may have already occurred (from the 9v. pack) but until I know the correct wiring of batteries in a working unit, I don't want to risk applying a reverse polarity myself!
This is the very reason I have made the post.  I want to be Irish !  To be sure to be sure!   
It would also give me a bit more confidence that the schematic references to the connector numbering plan is matching what I think is the physical layout on the PCB.
Please help in preventing smoke from coming out!

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