Notices
JK Electrical, Lighting & Sound Systems Bulletin board forum regarding topics such as stereo head units, CD players, MP3 players, speaker systems, amplifiers, hardmounted GPS devices, computers, headlight upgrades, fog lights, off-road lights, general wiring and anti-theft devices.

Single Switch Kit Relay Help?

Thread Tools
 
Old Jan 4, 2011 | 09:53 AM
  #11  
JK-Ford's Avatar
JK Junkie
 
Joined: Nov 2008
Posts: 3,297
Likes: 8
From: Cabot, Ar.
Default

Originally Posted by Lorrel
WOW, temper, temper.
Since the switch should be used, and is being used to control the relay coil, and that coil will most likely draw miliamps, I would have to agree with eaglemikeo here. Should either the switch or the coil short, the circuit is protected by the fuse. I would also agree the wiring should support the fuse size for the control circuit, and the power circuit for the lights should also be protected by the proper size contacts in the relay, as well as the wiring be large enough to support the lamps as well as the fuse that is protecting that circuit.
As far as switching a ground I believe it to be bad practice just as switching a neutral in an AC circuit.
Of course I don't have all that college, nor do I have any auto manufactures training, but it is still my opinion, and it is set in my mind by 24 years military service working with electricity and electronics, as well as being a troubleshooting and repair electrician with a very large printing company for the past 20 years.
But then again everyone has an opinion.
Are the factory switches really wired to switch the ground?
X2 for me also. Electrician for 30 years. Systems control technician for 12 of those years. Switching the ( - ) side of a circuit is very "Old School". I have seen this done on some older model automobiles and even in some structures wired in "nob and tube". The theory only protects the "switch leg". You still have to have a ( + ) on the other side of the load. And that is protected by----a fuse! I also do not like the idea of having constant power on a load. Makes troubleshooting a little more exciting though. I believe that the National Electrical Code is also against this idea.
Reply
Old Jan 5, 2011 | 09:42 AM
  #12  
JK Enthusiast
 
Joined: Feb 2009
Posts: 110
Likes: 0
From: Santa Clarita, CA
Default

X2 for my also. Some circuits on a vehicle are switched on the ground side; because they need to be constantly hot. Like the dome lite circuit. A fused hot leg generally runs through the light; and then parallel to the many door switches. Each switch is looking for a ground to complete the circuit. That way the dome lite will come on when you open the door......BEFORE you put the key in the ignition.
Conversely, as many of us who have done the mod know, the front and rear lockers are hot (when ign on); and looking for a ground to engage the locker.
The whole thing seems to be six of one; and half a dozen of the other!
Reply




All times are GMT -8. The time now is 12:09 AM.