Re: Adding power window relays
[Re: Ludington1]
#142386
10/27/08 11:32 PM
10/27/08 11:32 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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It might have been me who suggested using two SPDT relays to take the load off the switches for the power windows. If I recall correctly, the yellow wire in the switch harness is a direct +12v source comming from the window switch relay (power only on when ignition switch is on), and then going to a circuit breaker that gets power from the ammeter connection in the dash. If you tap (splice) into that yellow wire for power you won't need to add any new wires. The rest if the connections are just made to the factory motor connector. Seperate the factory connector going to the motor, and the side that goes to the switches is now used to energize each side if the relay, the connector wires going to the motor now connect the the high current part of the relay (the common side.) On the SPDT relay, one side is connected to the +12v power from the yellow wire, the other throw is connected to ground. Each relay will have two ground connections one for the relay coil and the other to groung the wingow motor through the relay. The idea is that both normally closed contacts of the relay(s) are grounded, so both wires to the motor are grounded when no window switch is pressed. When you press the window switch, you only apply +12 volts to one relay at a time for up or down because when the 12 volts energizes one relay, the relay switch breaks its ground contact and switches the the +12 volts supplied from the yellow wire, while the other relay stays grounded. The relays will need to be grounded to the door, and my door seems to get a good ground through the hinges, but you could add a ground wire if your having trouble getting a ground.
Anyhow, I hope that helps explain the workings. It looks like you have a good idea of what to do, and that connector looks really nice. If you need more help I could draw up a schematic with the realy terminals identified.
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Re: Adding power window relays
[Re: 451Mopar]
#142387
10/28/08 12:36 AM
10/28/08 12:36 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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If you can find these Potter & Brumsfield VBA-1001 relays they are pretty nice for this application, they really reduce the number of connections, but they also use a special plug connector. The only source I found for these was TYCOs authorized distrubitor.
If you were wiring this relay in this is where the connections would go: After disconnecting the two wire connector goint to the window motor... A & F - connect to the switch side wires. B & E - connect to the motor side wires. C - connects to +12 volt 12 AWG yellow wire. D - connects to ground. my photo is not real clear, but 'D' is the upper connections and jumps over the connection that is 'C'.
Last edited by 451Mopar; 10/28/08 12:49 AM.
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Re: Adding power window relays
[Re: 1_WILD_RT]
#142389
10/28/08 01:04 AM
10/28/08 01:04 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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Quote:
Are all five wires in the connector & attached to the switch? Like I stated earlier the yellow is power for each of the three non master switches, all original grounding is done throught the master & a ring connector on the drivers "A" pillar...So for any window to work the master has to be plugged in & the single switch to that location has to be plugged in..If you run the window from the master power is supplied by the tan wire...
The Yellow wire is the key, it supplies power to all four switches. In the original wiring the three single switches have to GROUND through the master switch to work, but with the relays, the grounding is now through the relay only. Believe me, one of the reasons I did this is the ground prong wire on my master switch was melted pretty good.
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Re: Adding power window relays
[Re: 451Mopar]
#142390
10/28/08 01:59 AM
10/28/08 01:59 AM
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Joined: Jan 2004
Posts: 27,347 Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
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Today? Who Knows?
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Quote:
If you can find these Potter & Brumsfield VBA-1001 relays they are pretty nice for this application, they really reduce the number of connections, but they also use a special plug connector. The only source I found for these was TYCOs authorized distrubitor.
If you were wiring this relay in this is where the connections would go: After disconnecting the two wire connector goint to the window motor... A & F - connect to the switch side wires. B & E - connect to the motor side wires. C - connects to +12 volt 12 AWG yellow wire. D - connects to ground. my photo is not real clear, but 'D' is the upper connections and jumps over the connection that is 'C'.
On one side it makes for a really clean install, but the standard format Bosch relays are so easy to find & so flexable in what you can do with them...I doubt it would be worth it to many people.. If someone wants to try it here's a link to the data sheet... http://www.sourceresearch.com/potter/Potter-Brumfield-pdf.cfm?PdfPage=vba_dsw.pdf You'll need to order the connectors seperately along with the terminals & they require a special crimping tool... Like I was saying, Bosch relays...
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Re: Adding power window relays
[Re: 451Mopar]
#142392
10/28/08 09:42 AM
10/28/08 09:42 AM
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Joined: Jan 2004
Posts: 27,347 Today? Who Knows?
1_WILD_RT
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Quote:
Also looking at the photo of the dual relay setup, the 87a wires should be larger gauge as they have to handle the same current as the +12 volt side.
Go back & look at my first post in this thread...
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Re: Adding power window relays - Updated
[Re: 451Mopar]
#142394
10/28/08 07:54 PM
10/28/08 07:54 PM
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Joined: Jul 2005
Posts: 3,072 Farmland, IN
Ludington1
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OK guys, got it all together today and the windows are working. I've got to replace the grounds with some heavier gauge wire, as stated above, but they ARE working. As suspected, my original photo shows how to correctly wire the relays, but the factory harness has to be there (which was where I screwed up yesterday). Thanks guys Darren
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