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viper 5906v, 2013 wrx sti


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jsigna 
Copper - Posts: 151
Copper spacespace
Joined: July 25, 2014
Posted: August 02, 2014 at 11:15 AM / IP Logged  
Okay so scratch the e brake..
I hooked up the rear defogger.. that is a 12 volt pulse.. SHould I wire a diode it band facing RS as when I activate the defogger normally it sends a 12v pulse too the defogger and right now the RS?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: August 02, 2014 at 11:24 AM / IP Logged  
No, in theory yes but it doesn't cost to play safe.
catback 
Silver - Posts: 703
Silver spacespace
Joined: August 13, 2002
Location: Canada
Posted: August 02, 2014 at 11:30 AM / IP Logged  
You must have got a sale on diodes, your throwing them everywhere.
The rear defogger output is a ground pulse, this must match how the car works otherwise you will have to invert it.
You have diodes to spare so sure you can use one or even two. Are they necessary (required), I doubt it.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: August 02, 2014 at 11:31 AM / IP Logged  
Which feeds a relay do we assume the OEM relay has diode protection?
catback 
Silver - Posts: 703
Silver spacespace
Joined: August 13, 2002
Location: Canada
Posted: August 02, 2014 at 12:25 PM / IP Logged  
howie ll wrote:
Which feeds a relay do we assume the OEM relay has diode protection?
*May* feed a relay, *may* feed an external control/timer module I don't know. In any case unless your going to dig up the relay and wire a diode in parallel to it's low-current coil then you don't have a quenching diode you only have back feed prevention.
Further more, outputs designed to be connected to coil devices are generally designed to tolerate the collapse of the magnetic field on the coil. A quenching diode is still beneficial on a starter kill relay because what I'll call the buzzer effect. That is when the circuit doesn't work as you'd expect due to some fault and the relay rapidly activates and deactivates which if you ever meter it generates a nice amount of AC voltage (not a clean sine wave however).
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