Relay Buzzes When the Dome Lights Fade Out
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=55997
Printed Date: July 07, 2025 at 11:00 AM
Topic: Relay Buzzes When the Dome Lights Fade Out
Posted By: Joe Neal
Subject: Relay Buzzes When the Dome Lights Fade Out
Date Posted: May 18, 2005 at 9:26 PM
2005 Chev Tahoe with fading Dome Lights.
Have installed a SPDT Relay to convert Positive Dome Light Output to Negative Dome Light Output.
The Relay Buzzes when the Dome Lights Fade out.
Does any one know how to correct the problem or is there something else I could use to convert Positive Dome Light to Negative
This is for a aftermarket Video Flip down, and the only Dome Light wire is a NEGATIVE Input
Replies:
Posted By: Ween
Date Posted: May 18, 2005 at 10:54 PM
Posted By: Joe Neal
Date Posted: May 19, 2005 at 7:51 AM
Done that................Has worked good on other Tahoe's, but am having a problem on this one. Tried 3 different voltage Z-Diodes, Variable Resistor & Caps. Still buzzes
Posted By: Ween
Date Posted: May 19, 2005 at 8:10 AM
should be able to use a one amp (1N4001) diode, 2200uf cap...never had a problem using a bosch type relay. what relay do you have? mark
Posted By: Joe Neal
Date Posted: May 19, 2005 at 9:05 AM
Have used Bosch & Optilux
Both are 30/40amp, SPDT
Bench test it works fine when we drop the voltage
Tahoe, it still buzzes when Dome lights fade out.
Approx. 2.7 volts accross Cap.
????????
Posted By: Joe Neal
Date Posted: May 19, 2005 at 9:10 AM
This is how I did it last year and it worked great: https://www.the12volt.com/installbay/forum_posts.asp?tid=42496&KW=Joe+Neal I must be missing something
Posted By: Ween
Date Posted: May 19, 2005 at 5:21 PM
scrap the zener and potentiometer, use a 1N4001 in series on the grey/black and a 2200uf cap across the coil. did one today in a 2005 Escalade....worked fine : ) mark
Posted By: infbaffle
Date Posted: May 19, 2005 at 7:04 PM
am I missing something? can't you attach the relay output to the negative driver door sensor wire located in kickpanel or driver door boot?
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infbaffle
Posted By: infbaffle
Date Posted: May 19, 2005 at 7:18 PM
that is, to all the door sensor wires.
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infbaffle
Posted By: Joe Neal
Date Posted: May 19, 2005 at 9:05 PM
Trying to make a 1 step procedure. It is for Dome lights in Flip Down Monitor that has only Negative Input.
Will try again Monday with ---1N4001 in series on the grey/black and a 2200uf cap across the coil.
If that still doesn't work will try timer
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