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door trigger dome on a video unit


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dedlyjedly 
Copper - Posts: 94
Copper spacespace
Joined: November 17, 2004
Location: United States
Posted: January 15, 2005 at 12:08 PM / IP Logged  

i recently installed a video system in a '05 gmc crew-cab.  the unit went in over the spot where the factory domelight had resided.  when attempting to hookup the video  unit's light to the door trigger i get a lot of wierd radiated noises in correlation to the dimmer/delay circuit in the gm.  has anyone ever run into this? ive tried all sorts of noise filters, but still cant get rid of it. 

also, i did have to use a relay to swap the polarity of the door trigger

MECP certified, 5yrs experience, you probably otta listen bitch!!
vk3hau 
Member - Posts: 8
Member spacespace
Joined: January 17, 2005
Location: Australia
Posted: January 19, 2005 at 6:48 AM / IP Logged  
Try placing a diode (say a 4001) across the relay to stop back EMF causing the chatter from the dimmer/delay module.
the diode needs to go across the coil on the relay.
or maybe you could mod the video system's domelight circuit to suit the same as the O.M.E.
hope that helps.
door trigger dome on a video unit -- posted image.

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