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wiring up thermos for overide and normal thermostactic contr
Posted: Thu Mar 25, 2004 10:33 pm
by Webbie
Have two fans to hook up and have brough a couple of switches one has on/on the other is on/off .
i want to b able to set it up so that when on trails it can b on all the time but when cruising i'd like it to be run off the sensor.Can someone draw up a diagram that is simple to understand will be much appreciated.
BTW they come with a simple loom which contaned a relay but can i use one relay for both units
Posted: Fri Mar 26, 2004 5:36 pm
by dumbdunce
you only need one on/off switch. you can run both fans off one relay if the combined current requirement of both fans does not exceed the rating of the relay - automotive relays are usually 30 or 40A, so if your fans require less than 15A (20A) each, you'll be right on one relay, otherwise just stack 2 in parallel.
diagram below shows where to put a switch to override the thermo sensor.
Thermos
Posted: Sun Mar 28, 2004 9:17 am
by Webbie
Thankx DUMBDUNCE
Posted: Sun Mar 28, 2004 6:35 pm
by ORSM45
i drew one that looked exactly like that but it didnt work for some reason.
Posted: Sun Mar 28, 2004 10:02 pm
by Rainbow Warrior
I ran 2 thermostats at different set points for each fan and had a light on the dash come on with the higher one to let me know the motor was working hard or getting hot.
Posted: Mon Mar 29, 2004 9:45 am
by dumbdunce
Rainbow Warrior wrote:... and had a light on the dash come on with the higher one to let me know the motor was working hard or getting hot.
isn't that what the temp gauge is for?
Posted: Mon Mar 29, 2004 2:16 pm
by greg
Hey Dumbdance,
Could you take that diagram a bit further for me please...
I'd like to be able to stop the thermo fan with the switch (i.e. for driving through water crossings or bog holes. I gather this would need a switch with an ON(override)-ON(computer controlled)-OFF(completely)
I'd also like a light on the dash to show when the thermo is running.
I presume that should all be pretty doable?
Thanks in advance,
Greg
Posted: Mon Mar 29, 2004 5:04 pm
by dumbdunce
yep I'll do it up tonight...
Posted: Mon Mar 29, 2004 7:59 pm
by ORSM45
just put a 2 position switch (on / off) on the wire feeding the other switches.
Posted: Mon Mar 29, 2004 8:11 pm
by landy_man
i would prefer to have a light on the dash to show that the thermos are OFF...
Posted: Mon Mar 29, 2004 9:03 pm
by Kev80
Personaly i would prefer the light to be on when the fan is switched off for water crossings etc incase you forget to turn it back on.
If the fans are only to aid the existing engine driven fan then this may not be nessassary.
greg wrote:I'd like to be able to stop the thermo fan with the switch (i.e. for driving through water crossings or bog holes. I gather this would need a switch with an ON(override)-ON(computer controlled)-OFF(completely)
I'd also like a light on the dash to show when the thermo is running.
See below.
Posted: Mon Mar 29, 2004 11:29 pm
by dumbdunce
extended diagram with master switch, auto/manual switch, and wiring for all kinds of warning lights.
SW1 is a ON/OFF (SPST) switch, it is the MASTER system on/off switch
SW2 is a ON/ON (SPDT) switch, it is the AUTO/MANUAL ON selector
L1 is the 'FAN SYSTEM OFF' warning light
L2 is the 'FAN SYSTEM MASTER SWITCH ON' indicator light
L3 is the 'FAN RUNNING' light (independent of fan mode)
L4 is the 'FAN SYSTEM AUTO MODE' light
it is possible to have a 'manual mode' light also, I'm trying to think of a way to do it without a diode/transistor/anything else with spindly legs to keep it simple.
ahh crap the server must be full it wont accept any attachments, will try again in the morning if I have time.
remind me.
Posted: Mon Mar 29, 2004 11:35 pm
by Rainbow Warrior
dumbdunce wrote:Rainbow Warrior wrote:... and had a light on the dash come on with the higher one to let me know the motor was working hard or getting hot.
isn't that what the temp gauge is for?
Unforetunately I and I suspect many others have the habit of not noticing a high temperature guage during the heat of trying to better a good mud hole / hill.
Also wire it to the relay, if you wire it to the fan it'll generate power and light up from windspeed on the freeway
Posted: Tue Mar 30, 2004 9:35 am
by greg
dumbdunce wrote:remind me.
Consider yourself reminded
Posted: Tue Mar 30, 2004 4:28 pm
by Kev80
dumbdunce wrote:ahh crap the server must be full it wont accept any attachments, will try again in the morning if I have time.
remind me.
Didn't work for me either, thought it was my puter.
Rainbow Warrior wrote:Unforetunately I and I suspect many others have the habit of not noticing a high temperature guage during the heat of trying to better a good mud hole / hill.
What happens if you split the lower radiator hose while driving the freeway ? Thats why i fitted a low water alarm to the radiator as id guess it would take only a couple of minutes to cook an engine.
Posted: Tue Mar 30, 2004 10:03 pm
by Rainbow Warrior
Rainbow Warrior wrote:Unforetunately I and I suspect many others have the habit of not noticing a high temperature guage during the heat of trying to better a good mud hole / hill.
What happens if you split the lower radiator hose while driving the freeway ? Thats why i fitted a low water alarm to the radiator as id guess it would take only a couple of minutes to cook an engine.[/quote]
Same thing that probably happens without a warning light, but I'll take my chances having the warning light. Of course low water alarm is even better, but using it to switch your thermo fans is a bit late.
Posted: Fri Apr 02, 2004 2:36 pm
by Patroler
I rewired my thermos using a few relays and two switches, one large aircraft safety switch, which when flicked on disables the fans (water crossings etc), it will also sound a reminder alarm if the engine temp goes above the thermo switches setpoint while the fans are disabled, turn the switch off and the fans start and alarm goes off. The other switch is for auto/on operation, it has dual colour lights, so when in auto mode it lights up white when fans are turned on by the temp switch, and when flicked to manual it lights red as the fans run constantly. It is also set up so that if the ign is off the fans will only run if the tem is high, not manually.
Have you sorted it out yet?
If not i may be able to scan a diagram - am at work now
and don't own a computer
Posted: Fri Apr 02, 2004 3:43 pm
by dumbdunce
greg wrote:dumbdunce wrote:remind me.
Consider yourself reminded
ok
I just got out of hospital this morning
Posted: Fri Apr 02, 2004 4:12 pm
by greg
dumbdunce wrote:I just got out of hospital this morning
Sorry to hear you were in there in the first place - but glad to hear you're out again.
Thanks for the diagram mate - look like exactly what i needed... or at least once i make proper sense of it i'll be able to get what i need from it
Thanks again.
Greg
Posted: Fri Apr 02, 2004 5:37 pm
by Kev80
Geez DD, its only a fan set up.
gtwebbie, personaly i would keep it simple, less dramers later.
Posted: Sat Apr 03, 2004 1:34 pm
by dumbdunce
I agree kev. you can pick and choose which lights you want/need and lots can be left off if you don't want fancy indicator lights.
Posted: Wed Mar 23, 2005 11:50 pm
by toughnut
The diagrams didn't come up for me dumb dunce. I know you posted this a long time ago but any chance you could Tonka your diagrams?