Relay queery

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Coffeelandy

Coffeelandy

Well-Known Member
Posts
2,297
Location
SE Cornwall (forgotten part!)
Gents,
I've wired in my Mazda RX8 seats to a permanant live with a 20amp fuse inline, they work perfectly. I haven't wired up the seat heaters into this circuit by the way. That'll go to a switch off of ignition and a seperate relay.
I was a little paranoid about electrical fires so I decided to have a go at putting a relay in for the seat movement.
I set this up as permanent live, 20 amp inline fuse and then to the relay but the seats won't move now. Is it overkill putting the relay in, what am I doing wrong?
 
Think of the relay as a switch that is operated by electrical current. A simple 4 pin relay will have 2 pins that you use for the switching circuit, and the other 2 for what ever you are powering. You would need to have a supply from your switch to the relay, this will "turn the relay on" which will then supply power to you seats.
 
blue beasty said:
And wires should be rated higher than fuses. Wires acting as fuses is what causes fires :eek:
Click to expand...
Awesome, thanks Mate that does help a lot. I wonder if a 5 pin relay would work for me. I'll try it out and let you know the results. Will the seat movement switches behave as a switch for the relay though? Maybe they aren't triggering it? I'll change the fuse too! You just may have prevented my Landy from catching fire!!!!
 
Maybe worth getting someone to help you with the wiring ?, guessing may result in blowing more than a fuse.
 
potus said:
Maybe worth getting someone to help you with the wiring ?, guessing may result in blowing more than a fuse.
Click to expand...
I think you're right it's not too scary to deal with the movement but if I do the heated seats bit wrongly I think there's a major fire risk there as I'm guessing they draw some decent juice.
 
Last edited:
It sounds like the switches aren't getting power due to the relay being in the circuit, and hence not energising the relay to turn on the power supply.

How were they wired in the original vehicle? I suspect the seats themselves already have relays built into them to switch the motor power. If this is the case, they'd just be wired with a continuous fused live. It's worth finding the original wiring diagram so you can see what's needed.
 
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