sorry ,I get the switch light bit now , but the point about operating the manual switch and having a direct short still looks to be a possibility..
One side of the lamp is grounded via the manual or thermostatic switch.
At the same time the relay closes and supplies the other other side of the lamp (and the fan) with 12v.
Are you reading the ground symbol as being a supply rail..?
Looking at your circuit diagram, connect the earth on the lamp to the earth on the fan or earth the lamp at the switch. You have it connected to the 12V supply from the relay.Radiator fan needs rewiring following the brew-up and subsequent bush mods...
Ive fitted a new thermostatic switch (95c/83c);
I have a manual switch on the dash with integral lamp, so would like the lamp in the switch to illuminate whenever the fan is running (or more accurately when it has power) either activated by the thermostatic switch or the manual over-ride.
This is what Ive come up with;
View attachment 301643
Anyone seeing any flaws with this..?
Looking at your circuit diagram, connect the earth on the lamp to the earth on the fan or earth the lamp at the switch. You have it connected to the 12V supply from the relay.
I've coloured in the 12v supply paths to make the observation clearer. I'm happy to concede if my electrical circuit understanding has gone awol over the years.The bulb is connected to the 12v supply from the relay, and the earth is via the manual or thermostatic switch...
If I disconnect the bulb wire going to the relay 12v output and connect it to earth then the lamp would have earth on both sides and will be very dim!
Have I drawn it weird or something..?
Im not that familiar with indicator wiring really, but this is a straightforward relay and simpler, in that it doesnt cycle on-and-off..!im still struggling with it lol.... my understanding of the way an indicator light works on a manual switch means that if you supply it from another source that source will go to ground as it will take the easiest path... but thats with the little switches with an indicator light that im familiar with and have used... the indicator light on them has its own ground and takes its supply once the switch is closed...ie it becomes part of the load that is switched.. but as I said you will find out when you wire it up ...
your switch is on the ground side of the coil and not switching a load on the positive side as is usually more normal I think... ie your load is the relay coil which will have a voltage on it even when your switch is open and your switch completes the circuit to ground...
Andy
no other suggestions , and nothing wrong with switching on the ground side.. most stuff controlled by an eco would be ground switched I think...Im not that familiar with indicator wiring really, but this is a straightforward relay and simpler, in that it doesnt cycle on-and-off..!
Switching the ground makes it easier to run only two wires from the engine bay (where the relay lives) to the dash, it allows me to run one single wire to the thermostatic switch (and take the other side to a convenient chassis point), and its much simpler to illuminate the integral lamp as otherwise I would have to work out how to turn the lamp on when the thermostatic switch closes.
The was the simplest and most elegant way I could think to do it...
Im open to other suggestions...
Made me chuckle remembering your wheel "moment", a slight slip and correction in the icy snow today and SWMBO had a big old meltdown; imagine if our wheel had come off!There must be something wrong with me as Im fairly unflappable...