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Using Relays for Window Roll-up!

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Member - Posts: 3
Member spacespace
Joined: December 05, 2003
Location: United States
Posted: December 06, 2003 at 8:36 PM / IP Logged  


  I have a 94 explorer XLT and want to add window roll up, and window roll down to my existing alarm (omega/ 4-button remote). I want to use relays, instead of a module. Would I start with the wires coming from the driver door for all the windows, or do I have to do all doors seperate? How do I go about wiring these relays for up/down. I know how to do a drivers door priority relay configuration, would it be similar? Any help would be great!   Thanks,   Jeff

Platinum - Posts: 5,041
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Joined: December 23, 2002
Location: Arizona, United States
Posted: December 06, 2003 at 8:44 PM / IP Logged  
If all you wanted was to use relays, all you would have to do is wire them the same as five wire doorlocks. I would, however, recommend using a module that is designed for power windows. If you are going to use relays you will have to incorporate limit switches into all of the windows to tell the relays to shut off when the window comes to a stop, if you don't the motors will burn up quickly.
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Silver - Posts: 535
Silver spacespace
Joined: October 11, 2003
Location: Michigan, United States
Posted: December 06, 2003 at 8:49 PM / IP Logged  
i agree with auex, the module is the safest way, what if a kid sticks his head in the window while it is going up? lawsuit waiting to happen.
Member - Posts: 3
Member spacespace
Joined: December 05, 2003
Location: United States
Posted: December 08, 2003 at 4:16 PM / IP Logged  
Well thanks for the help. I guess that I should just get a module. I like to learn things about car electronics, that was why I wanted to use the relays. I wanted to learn the hard way, not just plugging in a few wires with a module. Not to mention the fact that I have over 250 relays, from removing and installing alarms. Thanks,   Jeff
Copper - Posts: 89
Copper spacespace
Joined: December 29, 2003
Location: United States
Posted: January 10, 2004 at 12:14 PM / IP Logged  

well, since you have such an abundance of relays and want to learn, you could build your own module by doing the following:

get yourself an amp meter capable of reading 0-20 amps.  connect it inline with your current window circuit and measure the current it uses when the window is going up and down..... then measure the current when the window is already up, and you try to roll it up (or it's already down and you roll it down) -- lets assume you already did that, and the free moving amperage of the window is about 12 amps - and the "bottom out" or blocked current draw is around 18 amps.   go to an auto parts store, and get yourself a couple of 15 amp auto-reset circuit breakers.  now, what you can do is something like this for each window (since i'm not sure just what you want your alarm to control, i'll have to assume you want them rolled up on lock, and i'll also assume your alarm has a momentary output circuit for door locks (which i wouldn't reccomend using for rolling the windows down, unless you have a two or more button remote, then you could use the trunk unlock button as the unlock/roll windows down function) - anyhow.... I'm also going to assume your alarm has a + when armed or a - when armed (for my example, i'm going to use a - when armed, but if your alarm has a + when armed, you can improvise by reversing polarity from the door lock input on the relay)  use the diagram below for each window to roll it up, you can improvise on it for rolling down, etc - you shouldn't have a problem with it -- just remember that your circuit breaker must be a couple of amps below the blocked current draw but at least the same or preferedly 1 or 2 amps above the unblocked current draw.  enjoy.

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