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ford parking light switch


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oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: February 28, 2012 at 12:18 AM / IP Logged  
Using a -ve (ground) trigger has the advantage that you can add (parallel) other switches or triggers without worrying about the supply voltage or diodes.   
On the power side, I prefer switching +12V so that the circuit is not normally "hot" (powered). Plus it seems that cars with "strange lighting issues" (eg, might be on dimly when supposedly off) have ground switched lights (ie, +12V always applied to the lights; the relay (or switch) grounds them. (I did once know the reason...)
But that the beauty of a relay - you the switch polarity can be independent of the power polarity (eg, ground to energise the +12V power side). Not to mention shorter heavy wiring, lower voltage drops, and no switch strain.
pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: February 29, 2012 at 11:03 PM / IP Logged  
Mark Mizenko wrote:
I sometimes do(-) lights at the switch, with the relay interrupt. Works fine, never had a problem.
But i would ask david perez,
This may be a dumb question but who is David Perez
I drink current, eat ohms, and bleed voltage
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: March 01, 2012 at 3:22 AM / IP Logged  
zerepdivad is his username.  I have not seen any activity from him in a while.
pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: March 01, 2012 at 4:02 PM / IP Logged  
i am an idiot wrote:
zerepdivad is his username.  I have not seen any activity from him in a while.
I understand that but my question is why would I ask him about this topic? I'm not familiar with him.
I drink current, eat ohms, and bleed voltage
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