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wongojack:
Thanks very much for the response.  It takes a bit of effort to get my control panel off, so I have to do it this weekend (superbowl plans permitting)

I have a very detailed and possibly stupid follow up question:  When I'm testing the various contacts, do I have to touch the probes to bare wire?  So in other words, do I have to unscrew the connector on the iPac ground and pull the ground wire out and touch to that bare end, leaving it still connected to the iPac?  Can I touch the probes to the outside of the plastic around the wire instead.  I'll attempt a simple diagram:

       Pos0
     BLACK HERE                       Pos1   Pos2                                 Pos3   Pos4         Pos5
___    |                                     |      |                                       |       |              |
iPac | |                                     |      |                                       |       |              |                                       
  -----*-==================--*-|--*--==================--*--|--*---=====*=====
____|                                        __|___                                      __ |___
                                        NO  \| Sw1 |                               NO \| Sw2 |                                         
                                        NC  \|_____|                               NC \|_____|


= is insulated wire
- exposed wire
* is where I touch the probe

So in the above diagram If I touch Pos1, that will tell me the resistance between Pos0 and Pos1 and it will NOT test the connection to ground on switch 1- correct?  If I touch Pos2 it will test the connection on switch 1?  If I touch Pos4, it will test the connection on both switch 1 and switch 2?

Can I touch insulated wire and get an accurate reading or do I have to touch bare wire?  For example, can I touch Pos5 and expect to get an accurate reading?
                                                   

Ed_McCarron:

--- Quote from: wongojack on February 01, 2011, 04:07:47 pm ---
       Pos0
     BLACK HERE                       Pos1   Pos2                                 Pos3   Pos4         Pos5
___    |                                     |      |                                       |       |              |
iPac | |                                     |      |                                       |       |              |                                       
  -----*-==================--*-|--*--==================--*--|--*---=====*=====
____|                                        __|___                                      __ |___
                                        NO  \| Sw1 |                               NO \| Sw2 |                                         
                                        NC  \|_____|                               NC \|_____|



So in the above diagram If I touch Pos1, that will tell me the resistance between Pos0 and Pos1 and it will NOT test the connection to ground on switch 1- correct?  If I touch Pos2 it will test the connection on switch 1?  If I touch Pos4, it will test the connection on both switch 1 and switch 2?
                                                   


--- End quote ---

Yes.  As long as the switch is not conducting (open), it won't interfere.  If you touch pos 4, it'll test 3, 2, and 1, all the way back to 0.



--- Quote from: wongojack on February 01, 2011, 04:07:47 pm ---Can I touch insulated wire and get an accurate reading or do I have to touch bare wire?  For example, can I touch Pos5 and expect to get an accurate reading?
--- End quote ---

 :lol :lol :lol

Oh, wait, you were serious?   :)

Touch the probes to something metal and shiny.  Insulation does just that -- insulates.

clutch:

--- Quote from: Ed_McCarron on February 01, 2011, 07:46:18 pm ---Touch the probes to something metal and shiny.  Insulation does just that -- insulates.

--- End quote ---

 :lol :lol :lol :lol :lol :lol

wongojack:
I finally worked through this and was able to effectively measure resistance from the iPac ground connection.  I put the red prob right in the slat in the screw that holds the groud wire in place on the iPac and then touched the black probe to various connections on the switches.  I was able to identify the weak spot(s) and then fix them up.  Thanks for the responses and hopefully my stupid questions will help someone else.

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