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how many trigger switches can i have?


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ajan246 
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Joined: August 11, 2008
Location: Texas, United States
Posted: December 07, 2009 at 2:13 AM / IP Logged  
I am working on an install on a commercial truck, and the client wants every door of the truck's tool boxes to have a trigger switch. There are 4 doors and 6 tool box doors. How many trigger switches can i tie into the the same door trigger wiring? Or would i have to use auxiliary ports on the brain? the switches are simple self grounding pin switches.
any help will be appreciated.
thanks in advance,
ajan246
oldspark 
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Posted: December 07, 2009 at 4:12 AM / IP Logged  
If they are all grounding, they can just be connected together (ie, paralleled).
The client won't be able to tell which of the individual switches triggered that alarm, but maybe that is not important....
(Until false triggering occurs, but that can be dealt with later - maybe for now just considering how to isolate each input till the culprit is found.)
And I'd assume interference suppression is installed at the alarm end (used to be a (say) 0.1uF cap; may now include series ferrite thanks to GSM and other induced spikes - real-world installers should know...).
Powermyster 
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Posted: December 07, 2009 at 5:51 AM / IP Logged  
Make sure tool chests in the truck are earthed to the body if your just fitting pin switches
Why oh Why didn't i take the blue pill
Darren Power
howie ll 
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Posted: December 07, 2009 at 5:54 AM / IP Logged  
Exactly how I did it 10 years ago on a Winnie but I wired them in series and it still worked. No not quite, each switch was chassis grounded then the switched side led back to the "bus" which went back the alarm's trunk trigger so that knocking one out didn't ruin the others.
KPierson 
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Posted: December 07, 2009 at 7:24 AM / IP Logged  
I would put the vehicle doors on the door pin input then put the tool box doors on the trunk input.  The problem with tool box switches is they seem to fail and cause problems before OEM door switches do.  By seperating them it will make troubleshooting down the road a bit easier.
Kevin Pierson
howie ll 
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Posted: December 07, 2009 at 12:36 PM / IP Logged  
Kevin you're quite right, I didn't think to mention it because it's so obvious. The errors of assuming.
oldspark 
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Posted: December 07, 2009 at 3:16 PM / IP Logged  
howie ll wrote:
Exactly how I did it 10 years ago on a Winnie but I wired them in series and it still worked. No not quite, ...
I hope readers understand the significance....
I was imagining "it still worked" - yeah.... with all 10 doors open AND with all switches working!
Or all 4 - or all 6 - open & working for either circuit using KP's worthwhile suggestion.
Excellent suggestions the lot of you. Even "not assuming" that boxes are earthed (that's where paralleled 2-terminal switches are good).

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