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Relay Chatter When Wiring to Dome Light


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dsim 
Member - Posts: 6
Member spacespace
Joined: March 23, 2018
Location: North Carolina, United States
Posted: March 23, 2018 at 10:33 PM / IP Logged  
Looking for some professional help here. I wired up some rock lights under the body of my truck. At first wired to just a switch. Now I'd like to wire it up to the domelight and have succeeded. The dome light uses a switched ground. So I wired up a relay with some help from searching this forum. However I am getting some relay chatter still that is very annoying.
Below is the first configuration with the switch only.
Relay Chatter When Wiring to Dome Light -- posted image.
Next is the configuration that is giving me the chatter but WORKS.
Relay Chatter When Wiring to Dome Light -- posted image.
Here is my current configuration where i wired in a capacitor and a diode to try and eliminate the chatter. The chatter seems to be less now and sometimes it doesnt even do it... Not sure where I went wrong.
Relay Chatter When Wiring to Dome Light -- posted image.
Any ideas from the experts?
eguru 
Copper - Posts: 340
Copper spacespace
Joined: February 04, 2018
Location: Quebec, Canada
Posted: March 24, 2018 at 8:21 AM / IP Logged  
What is the point of the relay if you aren't using its contacts to feed the "rock lights"?
Why does 87 not go to the "rock lights"?
dsim 
Member - Posts: 6
Member spacespace
Joined: March 23, 2018
Location: North Carolina, United States
Posted: March 24, 2018 at 8:54 AM / IP Logged  
I am using the relay to handle the negatively switched domelight.
I want the setup to work two ways.
1)Switch Operated (On-Demand)
2)Whenever the domelight is on they turn on.
I used information from this link to get this far.
https://www.the12volt.com/relays/page1.asp
eguru 
Copper - Posts: 340
Copper spacespace
Joined: February 04, 2018
Location: Quebec, Canada
Posted: March 24, 2018 at 9:50 AM / IP Logged  
After 2nd coffee, it looks logical. The relay drop-out voltage is quite a bit lower than the pull-in voltage so either there is a lot of drop due to current draw of your lights or something amiss with the output of the 4x4 switch. What is the model number of that switch?
Try putting a suppression diode across the relay coil.
dsim 
Member - Posts: 6
Member spacespace
Joined: March 23, 2018
Location: North Carolina, United States
Posted: March 27, 2018 at 7:52 AM / IP Logged  
I have gone back over everything and confirmed wiring per the above diagram. As mentioned above the setup does have significantly less chatter (like a half second) than it did at the beginning. I have no idea what to do at this point....
Switch - Rated at 3A 12V - http://www.ch4x4.com/product/ch4x4-toyota-push-switch-rock-lights-symbol-4/
Rock Lights - 9W - https://www.amazon.com/gp/product/B01ABPGAUC/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Diodes - 1N4006 Rectifier Diode 1A 800V - https://www.amazon.com/gp/product/B00DYFH3M6/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Capacitor - 1000uf 25v - https://www.amazon.com/gp/product/B06WGPNM19/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1
Have not tried suppression diode? Should I be trying that? Was not sure how to wire that up properly in the current configuration, and honestly never heard of one.
Thanks in advance guys, I'd really like to get this nailed down.
dsim 
Member - Posts: 6
Member spacespace
Joined: March 23, 2018
Location: North Carolina, United States
Posted: March 27, 2018 at 12:15 PM / IP Logged  
In conjunction with what I have said above.
I would also like to point out that I have tried disconnecting the switch it self (pulled the harness off the back) and still get the buzz.
i am an idiot 
Platinum - Posts: 13,605
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: March 27, 2018 at 12:38 PM / IP Logged  
Capacitor across 85 and 86.
dsim 
Member - Posts: 6
Member spacespace
Joined: March 23, 2018
Location: North Carolina, United States
Posted: March 27, 2018 at 12:53 PM / IP Logged  
Additional capacitor across 85/86?
Or change it from 85/87 to 85/86
eguru 
Copper - Posts: 340
Copper spacespace
Joined: February 04, 2018
Location: Quebec, Canada
Posted: March 27, 2018 at 1:16 PM / IP Logged  
Lose the capacitors. They shouldn't be necessary. Measure the voltage across the relay coil.
EDIT: Does your dome light gradually dim before it goes off entirely?
dsim 
Member - Posts: 6
Member spacespace
Joined: March 23, 2018
Location: North Carolina, United States
Posted: March 27, 2018 at 3:53 PM / IP Logged  
Yes it does. Probably sends a pulsed ground signal which is the cause of the relay chatter to begin with...
The capacitor was supposed to counter this, and does... Just not fully.
Before chatter was about a second and a half, now its roughly a half second. I'd like to eliminate this entirely.
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