single relay for amp rack?

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=117730
Printed Date: July 07, 2025 at 4:39 PM

Topic: single relay for amp rack?

Posted By: ghost183
Subject: single relay for amp rack?
Date Posted: November 14, 2009 at 4:28 PM

hey guys, need alittle help here, i need to wire a momentary ON-OFF=ON switch to a relay, but how do i wire the relay to alternate between polarities? or do i need 2 relays?

the amp rack motor has 2 wires coming out of it, window motor and transmission, wired normally, spins counter clockwise, and when you filp the +/- , the motor spins in opposite direction

so how do i wire a momentary switch for, switch held up = rack slides out, switch held down = rack pulls in..

thanks guys

Replies:

Posted By: howie ll
Date Posted: November 14, 2009 at 4:50 PM

Use a 5 wire window switch from spal, MES etc.

Posted By: i am an idiot
Date Posted: November 14, 2009 at 5:18 PM

I do not know how hard it is to find a spal power window switch. The following diagram is the same thing as their switch. The switch is a Double Pole Double Throw Momentary On-Off-On switch.
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Posted By: howie ll
Date Posted: November 15, 2009 at 3:45 AM

Effectively the same Mr.I The spal switches are 5 terminals inline. Outers are motor wires, next in are the 2 grounds commoned of course to the outers at rest and the centre is your 12v+ feed.

Posted By: i am an idiot
Date Posted: November 15, 2009 at 7:20 AM

Since you asked about relays, https://www.the12volt.com/installbay/forum_posts.asp~TID~117734~get~last#574028

To wire the switch, you will need a single Pole Double throw momentary switch. Ground the center leg. Connect one of the remaining terminals to the wire labeled to 3 wire switch for up. Connect the last terminal to the wire labeled to 3 wire switch for down.

If you have 2 free aux output channels on your alarm system, it will be very easy to have the rack move with your remote of your alarm.

Posted By: ghost183
Date Posted: November 15, 2009 at 9:22 AM

thats awesome, thanks alot guys

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