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Adding power window relays
#142362
10/27/08 04:47 PM
10/27/08 04:47 PM
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Joined: Jul 2005
Posts: 3,072
Farmland, IN
Ludington1
OP
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OP
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Joined: Jul 2005
Posts: 3,072
Farmland, IN
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A member suggested this some time ago and I am trying it this week. I want to add relays to my power windows to get the draw out of the dash and hopefully speed them up a little bit.
I am attaching a pic of the relays I am using and have noted where each wire is going. This is using two Bosch 30Amp relays for each window, with the 12v coming from a wire on the hot terminal on the starter through the firewall to a fuse, then split off power for each window. For each window I have a setup as seen in this pic. I am getting 12v to the relays, but no luck making the windows work. I PM'd the member who suggested this, but I figured in the meantime I would see if anyone else sees what I'm doing wrong and maybe someone else can learn from this process.
I found these little holders at a stereo shop that holds two relays. My doubt is that I have the power coming IN on the purple wire as noted in the pic, and a small jumper wire shares that power to the other relay. Is that where I'm messed up... does each relay need a separate 12v feed, or it should work as-is?
Any other tips or suggestions are welcome!
Thanks in advance!
Darren
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Re: Adding power window relays
[Re: Ludington1]
#142363
10/27/08 04:56 PM
10/27/08 04:56 PM
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Joined: Jan 2003
Posts: 2,936
Richmond, VA
VT_Dart
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master
Joined: Jan 2003
Posts: 2,936
Richmond, VA
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You don't need a different 12v feed to each one as only one relay should be pumping 12v through to the 30 terminal at one time.
Is the switch giving a 12v signal when you hit it? An easy test is to simply touch either 85 or 86 to ground and the other to postive on a battery. You should hear them click. If they're good, then move onto your wiring. Check for 12v at the 87 terminal. If you have it, then check to make sure your ground (85 and 87a in your case), is a good ground. If that checks out, then move onto the switch input. Make sure that the switch is putting out 12v to energize that relay. If that checks out, then everything is working fine.
Darrah Heath
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Re: Adding power window relays
[Re: Ludington1]
#142367
10/27/08 05:13 PM
10/27/08 05:13 PM
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Joined: Jan 2003
Posts: 2,936
Richmond, VA
VT_Dart
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master
Joined: Jan 2003
Posts: 2,936
Richmond, VA
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The 87 vs. 30 does matter depending on what you're doing. 30 is your common, so it is in contact with 87a when at rest and 87 when energized. So you have ground going to the motors at rest, and 12v+ when energized (switch activated). Is that what you're trying to do? I'm still leaning toward the switch input. I'm not familiar with the power window switches, but they may also be putting out a ground signal rather than a positive. Grab a multimeter and see what your wire coming from the switch is doing when you hit the switch. Is it pumping out 12v+ or a ground? Focus on getting that relay to energize first. All it takes is a negative on 85 or 86 and a positive on the opposite terminal. Listen for that click, if you hear it then you're in business. If not, then something is wrong with either your 85 or 86 terminal. If you hear that relay clicking then you can move onto actually getting it to power the window motor.
Darrah Heath
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Re: Adding power window relays
[Re: VT_Dart]
#142368
10/27/08 05:27 PM
10/27/08 05:27 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
The 87 vs. 30 does matter depending on what you're doing. 30 is your common, so it is in contact with 87a when at rest and 87 when energized. So you have ground going to the motors at rest, and 12v+ when energized (switch activated). Is that what you're trying to do? I'm still leaning toward the switch input. I'm not familiar with the power window switches, but they may also be putting out a ground signal rather than a positive. Grab a multimeter and see what your wire coming from the switch is doing when you hit the switch. Is it pumping out 12v+ or a ground? Focus on getting that relay to energize first. All it takes is a negative on 85 or 86 and a positive on the opposite terminal. Listen for that click, if you hear it then you're in business. If not, then something is wrong with either your 85 or 86 terminal. If you hear that relay clicking then you can move onto actually getting it to power the window motor.
 break it down into sections... The window switches should provide ground to both output pins in the at rest position, moving the switch in either direction breaks the ground & applies power... Each window harness has a 12v power source but no ground, ground is feed from the master switch therefore in the neutral position both legs are basically a straight through connection back to the master, that way the master can apply power through either leg without grounding the signal.. or the window switch can isolate the motor & apply ground...Crazy stuff..
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Re: Adding power window relays
[Re: VT_Dart]
#142369
10/27/08 05:34 PM
10/27/08 05:34 PM
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Joined: Feb 2003
Posts: 8,671
Andrewh
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Joined: Feb 2003
Posts: 8,671
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 This is how I would expect it to be wired. I don' think you can wire 87 and 87a at the same time. one is on with no power applied, the other is on with power applied. I think you wired it a bit backwards.
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Re: Adding power window relays
[Re: 1_WILD_RT]
#142373
10/27/08 06:20 PM
10/27/08 06:20 PM
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Joined: Jul 2005
Posts: 3,072
Farmland, IN
Ludington1
OP
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OP
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Joined: Jul 2005
Posts: 3,072
Farmland, IN
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Thanks to everyone for your help. I'll get back out there in the morning and see if the relays will click. Looking at the passenger side door (I'll have to tackle the master switch afterwards): On the back of the window switch there are 5 prongs. 2 go to purple (one with white trace), 2 go to pink (one with white trace) and 1 is yellow. Those 5 wires go to an approx. 12" wrapped harness (which I would like to NOT unwrap) and out of that harness I have a single pink, single purple, and single yellow wire. I have the pink and the purple connected to the leads for pin 86 of the relays. Where does the yellow need to go? Thanks again Moparts  Darren
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Re: Adding power window relays
[Re: 1_WILD_RT]
#142379
10/27/08 10:17 PM
10/27/08 10:17 PM
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Joined: Jul 2005
Posts: 3,072
Farmland, IN
Ludington1
OP
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OP
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Joined: Jul 2005
Posts: 3,072
Farmland, IN
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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...
Randy - maybe this is where I've "seen the light"... on that passenger door I was removing the original harness as I was putting in the relays. I now see exactly what you're saying, I'll put it back together in the morning and update the post. I had gotten it in my head that this was replacing the factory harness, instead of just getting rid of the current draw.
Darren
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