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Audible relay clicking sound


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prince504 
Copper - Posts: 108
Copper spacespace
Joined: December 25, 2015
Location: United States
Posted: July 31, 2016 at 2:49 AM / IP Logged Link to Post Post Reply Quote prince504
I am using SPDT relay to power pair of 18W LED lights and I can hear a clicking sound (I assume the coil being energized) whenever the circuit activated.
Is this normal? The circuit does work fine; I just wished the relay for more quiet. The relay is mounted via zip ties to the left of the instrument cluster.
lurch228 
Silver - Posts: 1,338
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Joined: August 08, 2012
Posted: July 31, 2016 at 4:03 AM / IP Logged Link to Post Post Reply Quote lurch228
Yes it is the relay and it is normal to hear the contacts engaging. The do make solid state ones that are silent but there not cheap.
This ia a Hella branded one HELLA H41773001
Note:
On this solid-state relay terminal 85 must be connected
permanently to earth to ensure proper function over
terminal 86
Audible relay clicking sound -- posted image.
i am an idiot 
Platinum - Posts: 13,441
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: July 31, 2016 at 8:20 AM / IP Logged Link to Post Post Reply Quote i am an idiot
Are you hearing it through your speakers?
prince504 
Copper - Posts: 108
Copper spacespace
Joined: December 25, 2015
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Posted: July 31, 2016 at 8:37 AM / IP Logged Link to Post Post Reply Quote prince504
lurch228 wrote:
Yes it is the relay and it is normal to hear the contacts engaging. The do make solid state ones that are silent but there not cheap.
This is a Hella branded one HELLA H41773001
Oh ok. Just wanted to make sure it was normal. If that HELLA relay always needs to have 85 connected to ground, how do you wire the relay for a negative pulsed trigger out of curiosity?
i am an idiot wrote:
Are you hearing it through your speakers?
No. Only from its location in the dash. Since the vehicle is a diesel truck, with the engine on, it isn't audible.
lurch228 
Silver - Posts: 1,338
Silver spacespace
Joined: August 08, 2012
Posted: July 31, 2016 at 8:49 PM / IP Logged Link to Post Post Reply Quote lurch228
prince504 wrote:
Oh ok. Just wanted to make sure it was normal. If that HELLA relay always needs to have 85 connected to ground, how do you wire the relay for a negative pulsed trigger out of curiosity?
As far as I know you can't by design.
prince504 
Copper - Posts: 108
Copper spacespace
Joined: December 25, 2015
Location: United States
Posted: July 31, 2016 at 9:24 PM / IP Logged Link to Post Post Reply Quote prince504
lurch228 wrote:
prince504 wrote:
Oh ok. Just wanted to make sure it was normal. If that HELLA relay always needs to have 85 connected to ground, how do you wire the relay for a negative pulsed trigger out of curiosity?
As far as I know you can't by design.
Hmmm... Odd design. Upon further research, seems some buyers found out about that limitation the hard way
lurch228 
Silver - Posts: 1,338
Silver spacespace
Joined: August 08, 2012
Posted: August 01, 2016 at 12:37 AM / IP Logged Link to Post Post Reply Quote lurch228
Yup they sure did. That's why I always read the data sheets.
howie ll 
Pot Metal - Posts: 16,466
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Posted: August 01, 2016 at 3:26 PM / IP Logged Link to Post Post Reply Quote howie ll
What's the current draw on those lights? You can use a mini/PCB relay if under 15 amps else do the correct installation and mount the relay near to the lights, either engine bay or rear depending on lighting position.
N.B. Seal the relay from the weather!
PS, why is the relay mounted in dash? And if you can't hear it why post?
sparkie 
Platinum - Posts: 2,061
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Joined: November 06, 2003
Location: Canada
Posted: August 01, 2016 at 4:41 PM / IP Logged Link to Post Post Reply Quote sparkie
You can make it quieter by wrapping the relay tightly with electrical tape and then wrap some foam around it. Don't mount the relay to anything metal or large piece of plastic. That will only amplify the noise. Wrap the relay tight to a harness which won't conduct the noise as well and deep inside the dash.
sparky
prince504 
Copper - Posts: 108
Copper spacespace
Joined: December 25, 2015
Location: United States
Posted: August 01, 2016 at 5:05 PM / IP Logged Link to Post Post Reply Quote prince504
howie ll wrote:
What's the current draw on those lights? You can use a mini/PCB relay if under 15 amps else do the correct installation and mount the relay near to the lights, either engine bay or rear depending on lighting position.
N.B. Seal the relay from the weather!
PS, why is the relay mounted in dash? And if you can't hear it why post?
It's a pair of 18W lights so I would guess 3A in total. When you say "do the correct installation", are you insinuating that mounting the relay inside the vehicle isn't the "correct" way? Why is it better to mount it in the engine bay or rear? I got the power from the ignition harness so seemed like the better solution...
Secondly, I posted because the lights where installed on a friend's diesel truck and they intend to use the Aux lights in the night time when the engine is off -- to help mounting cargo to the truck's hitch. So wanted to know if this was normal in case they asked...
Also, what would you recommend to seal the relay in the future from the weather? Dielectric grease?
sparkie wrote:
You can make it quieter by wrapping the relay tightly with electrical tape and then wrap some foam around it. Don't mount the relay to anything metal or large piece of plastic. That will only amplify the noise. Wrap the relay tight to a harness which won't conduct the noise as well and deep inside the dash.
Thnx for the advice. I definitely agree about mounting to hard plastic as I quickly noticed that when I used 3M double sided tape to mount the relay initially
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