what relay do i need
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=127470
Printed Date: May 04, 2025 at 6:41 PM
Topic: what relay do i need
Posted By: escort14
Subject: what relay do i need
Date Posted: May 27, 2011 at 12:34 PM
Hi,
I am going to fit power windows into a nissan micra 1999 useing 4 relays 2 for each window i have found the wireing information i need on this site i just need to know what relays to use spst or spdt.
This is how i am going to wire them:
Thankyou all for any advice you can give me.
Replies:
Posted By: i am an idiot
Date Posted: May 27, 2011 at 12:45 PM
Posted By: itsyuk
Date Posted: May 27, 2011 at 5:18 PM
spdt
sp stands for single pole refering to the pole 30 in your case and the dt stands for double throw which refers to poles 87 & 87a.
its a double throw because only one of the throws are use at any given time. it throws one way (87) and then the other(87a,) when the coil circuit (85 &86) loses power or ground.
a similar relay rated as a spst (single pole single throw) would have only an 87 (if it was considered a N.O. (normally open)) or
an 87a ( "a" refering to "at rest" making it a N.C. (normally closed)) terminal.
make sure you used a relay that can handle about 30 amps and you shouldnt have any relay failure problems.
always carry an extra relay or two in the car in case you have a problem while one the road.
have you considered using a 530t dei window module instead?
for longer term reliability, dont ground the relays to the door.. ground them to the body.
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yuk
quiet rural missouri, near KC.
If your system moves you physically and not emotionally, you have wasted your money.
Posted By: howie ll
Date Posted: May 28, 2011 at 4:23 AM
Use a DEI 530t with your switches, not the relays.It will give you the option of one-touch up and down for both windows.
or get proper 5 wire switches from Spal, then NO relays required.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: escort14
Date Posted: May 30, 2011 at 3:17 AM
Thankyou for replies.
Where can i get a DEI 530t from and how much are they ?
if i use 5 wire switches what grade wire do i need to use how much are they where do i get them from ?
i need to do this as cheaply as i can.
Posted By: howie ll
Date Posted: May 30, 2011 at 5:57 AM
Probably £40-60 on ebay or a car alarm dealer.
1.5-2mm is all you need, windows will draw about 10 amps each.
what windows are you installing? From a breakers or a kit
Google Spal for switches.
-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: howie ll
Date Posted: May 31, 2011 at 3:42 PM
That switch is fine, good price, there should be two motor wires though, their spec is wrong!  ------------- Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: escort14
Date Posted: June 01, 2011 at 2:11 AM
Hi,
Thankyou for your prompt reply howie II i have zoomed in on the picture of the switch and there are 6 wires so i think that where it states blue/green in the specs it means 1 blue wire + 1 green wire not 1 blue,green wire if this is correct am i right in thinking this switch is fine for what i want to do ?.
Thankyou again for all your help.
Posted By: howie ll
Date Posted: June 01, 2011 at 4:52 AM
yes, absolutely OK.
-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: escort14
Date Posted: June 13, 2011 at 2:11 AM
Thankyou all for your replies i have now got 2 switches that let me do away with relays i hope to get them fitted in the next couple of weeks.
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