Thread: Relays .. One for the Auto spark in us

Originally Posted by Rangier Rover

Hi Mike,
Try a Relay with a built in resistor. What you are experiencing there is a common problem with non resistor relays when you start stacking them up like that.

Tony

Ta for that Tony .... was hoping for some "Yea / seen that before"

All the wholesalers would say is ... "mate we sell em / don't know what they do, but we got stacks of em"

All my relays have diodes in them ....

Mike

With mechanical switches the diodes probably don't matter. With transistors you need the diode to stop the voltage spike when you stop the drive to the coil, otherwise you end up puncturing the drive transistor.

Originally Posted by mike 90 RR

Ta for that Tony .... was hoping for some "Yea / seen that before"

All the wholesalers would say is ... "mate we sell em / don't know what they do, but we got stacks of em"

All my relays have diodes in them ....

Mike

As you know the diodes will only allow power to pass one way but have little resistance in the forward polarity.
Just thinking.... If you can't come up with a relay with resistor just wire in a small globe (2 to 5w) from the earth to the switching pole and see if the problem goes away.

There you go.... If it works just another hole to drill in all that plastic for another thingy

Tony

You still have the original condensor fans yea? if so, junk the relay setup, as you don;t need the AC input, the way they achieve low speed high speed is either operating them in series/paralell, basically junk the lot, use 2 relays to control the fans with you thermatic switch and your done, makes the whole lot simple and easy to fault find, plus if one fan craps its knickers, it don;t effect the other

I've wired more than one set off falcon fans, in both retaining the original control, for falcon engine conversions and just utilising the fans for others

Originally Posted by rovercare

You still have the original condensor fans yea?

I was gonna remove them so I get a clean air flow (no obstructions) to the radiator ... Just use the High / low setup on the Ford thermo fans .....

Mike

Originally Posted by Rangier Rover

Just thinking.... If you can't come up with a relay with resistor just wire in a small globe (2 to 5w) from the earth to the switching pole and see if the problem goes away.

But that means I will have to lift the bonnet every time, to see if the light is on, to let me know which fans working

Originally Posted by Rangier Rover

Hi Mike,
Try a Relay with a built in resistor.

Fitted them up on the weekend // bought resistor relays .... Top Stuff ... all works now /// like a charm