Relays- Help needed
Discussion
I'd agree with Pigeon, and consequently concur.
As has been said, the relay on the "professional" circuit diagram (just for identification, Pigeons diagram is fine too!
) has an extra ground connection which your relay does not appear to have. (It's marked G18)
This would be on the diagram, and in a timer relay, in order that the timing function could work.
If you want the timer I think you will need to get the relay indicated on the "professional" circuit diagram, rather than the one you have.
It is possible that the relay you have has functionality not indicated on it's case, but I think that's unlikely.
The resistor (shunt/parallel) with the coil, is a ballast resistor, that protects external transistor based electronics, where present, to some degree.
If you connect the relay that you have, as Pigeon has described, it will work the best that is possible.
Edited to add;
Having said that, I just looked at the picture of the relay again. I'm not now sure if the pin indicated in the middle and at the bottom is a second switching contact, or the ground that is necassary for the timer.
I can't be sure from the picture that the digit indicated next to that pin is an 'S'(ess) or a '5' (five). The contact on the moulded diagram for that pin looks a bit murky too.
Who knows (sorry).
>> Edited by dilbert on Monday 24th October 23:49
As has been said, the relay on the "professional" circuit diagram (just for identification, Pigeons diagram is fine too!
) has an extra ground connection which your relay does not appear to have. (It's marked G18) This would be on the diagram, and in a timer relay, in order that the timing function could work.
If you want the timer I think you will need to get the relay indicated on the "professional" circuit diagram, rather than the one you have.
It is possible that the relay you have has functionality not indicated on it's case, but I think that's unlikely.
The resistor (shunt/parallel) with the coil, is a ballast resistor, that protects external transistor based electronics, where present, to some degree.
If you connect the relay that you have, as Pigeon has described, it will work the best that is possible.
Edited to add;
Having said that, I just looked at the picture of the relay again. I'm not now sure if the pin indicated in the middle and at the bottom is a second switching contact, or the ground that is necassary for the timer.
I can't be sure from the picture that the digit indicated next to that pin is an 'S'(ess) or a '5' (five). The contact on the moulded diagram for that pin looks a bit murky too.
Who knows (sorry).
>> Edited by dilbert on Monday 24th October 23:49
So I could possibly have the wrong relay? If that's the case I can easily swap it, assuming the Ford parts guy can find the right one this time.
The easiest way to go outside to my Mondeo with heated front screen and borrow the relay from that! I will do that tonight
Thanks guys for all the replies (Mike; relays are actually way down on the list of jobs- the gearbox is in my shed and the engine is still in more than one bit at the moment- I am still fixing problems from le mans!)
I still don't get for sure where number 4 goes; is that another earth??
Dilbert, are you saying that the 2 bits between 1 and 2 are the coil and a resistor or is the 2nd bit a timing widget?? The bit at bottom middle is a 5 (that was the best scan /pic I could get after 0.5 hour of trying)
The easiest way to go outside to my Mondeo with heated front screen and borrow the relay from that! I will do that tonight
Thanks guys for all the replies (Mike; relays are actually way down on the list of jobs- the gearbox is in my shed and the engine is still in more than one bit at the moment- I am still fixing problems from le mans!)
I still don't get for sure where number 4 goes; is that another earth??
Dilbert, are you saying that the 2 bits between 1 and 2 are the coil and a resistor or is the 2nd bit a timing widget?? The bit at bottom middle is a 5 (that was the best scan /pic I could get after 0.5 hour of trying)
Steve,
It could be ok.
Basically, 1 is the signal connection and 2 goes to earth. When you put 12V into teminal 1 it will activate the switch.
In this instance the supply would run from the battery via a fuse, to terminal 3 then out to the heaters and tell tale light via terminal 5.
Terminal 4 allows current to flow from 3 to 4 when the timer is not active. When the relay is switched then the flow is broken. Can't think of an application for this off the top of my head, but it is faily standard foir a five pin relay.
Whats wrong with the gearbox? Have you identified the ticking from the engine yet?
It could be ok.
Basically, 1 is the signal connection and 2 goes to earth. When you put 12V into teminal 1 it will activate the switch.
In this instance the supply would run from the battery via a fuse, to terminal 3 then out to the heaters and tell tale light via terminal 5.
Terminal 4 allows current to flow from 3 to 4 when the timer is not active. When the relay is switched then the flow is broken. Can't think of an application for this off the top of my head, but it is faily standard foir a five pin relay.
Whats wrong with the gearbox? Have you identified the ticking from the engine yet?
Gearbox leaks,always has but got realy bad recently so I took it to be repaired (now done awaiting re fitting- a problemette with that but something I am sure I can overcome given time).
Ticking was (almost certainly) a rocker worn concave which has also been remidied with a set of refinished rockers and reassembled but not yet tested (becasue I need to put the gearbox back first). www.pistonheads.com/gassing/topic.asp?t=205269&f=34&h=0
Once that lot is done I can fit the windscreen; just getting the electrics ready on the dark winter evenings!
Ticking was (almost certainly) a rocker worn concave which has also been remidied with a set of refinished rockers and reassembled but not yet tested (becasue I need to put the gearbox back first). www.pistonheads.com/gassing/topic.asp?t=205269&f=34&h=0
Once that lot is done I can fit the windscreen; just getting the electrics ready on the dark winter evenings!
I have checked the relays in my Mondeo. Problem is that the handbook map and the actual fuse/relay box layout is not the same
The green one (as scanned) is in there so chances are that is the one, although the light still comes on on the switch if I turn the heated screen on with the green relay removed. The other relays are not as meaty as mostly only have 4 spades on them. BTW In the handbook the heated screen relay is marked as "timer" just dont know for sure which one it is!
The green one (as scanned) is in there so chances are that is the one, although the light still comes on on the switch if I turn the heated screen on with the green relay removed. The other relays are not as meaty as mostly only have 4 spades on them. BTW In the handbook the heated screen relay is marked as "timer" just dont know for sure which one it is!
stigproducts said:
The green one (as scanned) is in there so chances are that is the one, although the light still comes on on the switch if I turn the heated screen on with the green relay removed.
Your circuit diagram shows that the bulb has a separate feed, independant of the relay, so I would expect that.
Just give it a go and time it. If it is just a relay, it wont go off until you remove the signal feed. If it is the timer it should stop automagically.
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