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use dei 528t for timed courtesy light


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jdugan4859 
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Posted: January 10, 2010 at 2:06 AM / IP Logged  
I have an extra light in my headlights I want to use as a courtesy light. I want the light to come on when the ignition starts, and stay on for "X" secs after the ignition is off. Right now I have one hooked up, but its not doing what I thought it would do. I hooked the red and yellow wire to constant 12v, the BLACK/ white wire to ign 12v, the black wire to ground, cut the blue wire, and hooked the lights to the brown wire.
As it is, the lights do not come on when the ign is on, but they do turn on for the timed length once the ign is shut off. Any ideas on what to do?
KPierson 
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Posted: January 10, 2010 at 7:28 AM / IP Logged  
Can you use a 2nd relay in parallel with the timed relay to turn the lights on with the igntion?
Kevin Pierson
jdugan4859 
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Posted: January 10, 2010 at 11:05 AM / IP Logged  
Yeah I can, just would like to avoid the bulk of an extra relay.
KPierson 
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Posted: January 10, 2010 at 11:48 AM / IP Logged  

Replace the DEI piece with a Pac TR7.  Run in mode 6 and it will energize the relay when the ignition is turned on and then leave it on until a specified amount of time after the ignition is turned off.

The DEI piece is extremely limited in it's application.

Kevin Pierson
jdugan4859 
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Posted: January 10, 2010 at 7:48 PM / IP Logged  
I already have the 528 wired in, so what I did was run an ign. wire in, but diode isolated it so I don't get a back feed.
KPierson 
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Posted: January 10, 2010 at 9:15 PM / IP Logged  

How much current do your lights require?  How big of a diode did you put in?

Kevin Pierson
jdugan4859 
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Posted: January 10, 2010 at 10:34 PM / IP Logged  
They are a very small light, I have not measured the draw, but I used a 3amp diode. It seems to be working fine.
KPierson 
Platinum - Posts: 3,527
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Posted: January 11, 2010 at 4:57 AM / IP Logged  

A 3A diode would be good for MAX 18W bulbs (assuming there are two of them).  For good practice you shouldn't use bigger then a 9W bulb per side.

The thing about current draw is alot of times it will work great up until the point that it catches the car on fire.  I'm just trying to make sure your setup is safe. 

Kevin Pierson
jdugan4859 
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Posted: January 11, 2010 at 11:01 PM / IP Logged  
I thank you for watching out for me, I need to do the research on how much they draw, just hard to find info on the bulb. I have a Ranger and I am running the Headlights used on the Rangers made for Mexico and further South. I need to see if I can find a replacement bulb or an LED.
KPierson 
Platinum - Posts: 3,527
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Posted: January 12, 2010 at 5:23 AM / IP Logged  
If you can remove the bulb and measure it's resistance we can calculate wattage.  You could also measure the resistance of the output of the relay to ground and that would tell us the total current of both bulbs (do this with all power off).
Kevin Pierson

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