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Problem when daisy chaining the ground wire
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frynturn:
I have an interesting problem that is simply doing my head in because it should be sooooo simple.

I have a premade daisy chain for grounding my buttons which works fine, unless, you skip a connector in the chain.  If you do that then all of the buttons after that skip don't work.

In the picture below my wire goes from the ground on the ipac, 1st connector is empty, 2nd connector goes to P1 start, 3rd/4th connectors are empty, 5th/6th connectors go to P1 buttons 1&2.   Only the P1 Start button works?!



So I'm thinking there is a break in the chain somewhere but the weird thing is that if I disconnect the 2nd connector from P1 start button then suddenly the P1 buttons 1&2 start working!  Similarly if I leave connector 2 fixed to P1 start and chuck a couple of spare microswitches on connectors 3&4 I get all 3 buttons working.

So it can't be a break in the chain and it has left me stumped. 

Please embarrass me and tell me the obvious thing I am doing wrong.
Malenko:
has to be an issue with your crimping / break in the chain. Perhaps the switch being inserted is enough to fix the break?
Louis Tully:
.
frynturn:
I'll get the multimeter out again tomorrow and have another crack to see if I can find any bad crimps.  Continuity testing I did yesterday was fine but maybe I'll check resistence and see if there is any differences along the wire.

I just wanted to check there was no twilight zone thing happening I wasn't aware of.  There should be no reason why I can't skip connectors because everything is all joined together.
PL1:
In addition to the continuity/resistance checks when powered off, do voltage checks when it's powered on.

You may have a microswitch (or two) that is intermittently open/shorted depending on the force applied to the COM tab by the ground chain.

Sometimes gently wiggling the wire/tab will reveal the intermittent while testing with your multimeter.


Scott
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