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relaying a switched motor


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4epikanini 
Member - Posts: 3
Member spacespace
Joined: February 06, 2012
Location: South Africa
Posted: February 06, 2012 at 11:23 AM / IP Logged  
Hi
I'm busy rebuilding my father's car and the window winder cables and connectors are a bit old. They work fine but very very slow due to voltage drop.
I have checked direct power to the motors and then they run like mad!
Instead of redoing all the wiring and connectors - I tried cleaning contacts - doesn't work - I want to run power direct from the battery to the motor and have the original wiring just switch a relay.
Sourcing new power to the start of the window winder switch is not going to work eithe as that switch is pretty old as well and gives a bit of voltage drop as well.
Now....
The motor is not grounded. It has two wires coming from it.
If you connect them 12v - Ground - they go up
If you connect them Ground - 12v - they go down
So. I can relay them but in my mind I only see a 6 relay option per door with a large amount of wiring.
Is there a simple way of doing this? I understand relays but I can't wrap my head around this one to find a simple elegant solution.
Your help in this is much appreciated. Thanks in advance.
awdeclipse 
Copper - Posts: 285
Copper spacespace
Joined: August 05, 2007
Location: Michigan, United States
Posted: February 06, 2012 at 12:36 PM / IP Logged  
It can be done with 2-SPDT Relays
Option 1
Option 2
4epikanini 
Member - Posts: 3
Member spacespace
Joined: February 06, 2012
Location: South Africa
Posted: February 06, 2012 at 12:56 PM / IP Logged  
Perfect! Thank you so much!
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: February 06, 2012 at 4:37 PM / IP Logged  
You don't even need relays, a non-silicon spray in the channels plus new constant feeds, one per two windows, thicker gauge cables fused at 40 amps per two windows and run the grounds and power back to the battery.
4epikanini 
Member - Posts: 3
Member spacespace
Joined: February 06, 2012
Location: South Africa
Posted: February 07, 2012 at 1:35 AM / IP Logged  
i have bypassed the the 12v and ground coming in and the voltage drop through the switch is enough to slow it down quite a bit.
The motor is extremely sensitive to voltage drop.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: February 07, 2012 at 2:18 AM / IP Logged  
What vehicle?   BTW another method would be to wire in a 530t per pair of motors, you then get 1 touch on all the switches and the 530 does the trick (i.e. current switching).
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: February 08, 2012 at 8:54 AM / IP Logged  
This is al;l going round the houses, try a switch change first.
But before doing that have you actually measured the switches internal resistance? Seems silly when it might just be corroded switch or fuse or connector contacts.
offroadzj 
Gold - Posts: 2,043
Gold spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: June 03, 2005
Location: New York, United States
Posted: February 13, 2012 at 8:42 AM / IP Logged  
I am not 100% sure on this, but running a relay directly to the motor MAY bypass the resistance shutdown of the motor depending on where the actual shut down is located. If it is in the motor then you will be ok, but if it is built into the switch then you could have a problem. Basically if you ever happen to hold the button down for a little too long the motor will continue trying to open/close the window even though it is fully opened/closed. This will end up burning up the motor pretty quick.
Kenny
Owner / Technician
KKD Garage LLC
Albany, NY 12205

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