Smokydiesel Posted March 20, 2009 Share Posted March 20, 2009 Hi, I'm busy working out how to connect my electric fan to the X-eng thermostat I just bought. I need to be able to switch the whole circus On and Off with a single switch on the dash (not Carling type, just a simple On/Off switch) and will only be using the lowest temperature-side of the thermostat. But I would like to keep the amount of wires from and to the battery and engine bay to a minimum. Would this be a safe way to hook it all up ?: This way (I think) I only need to pull a fused wire from the battery, through a switch in the dash, towards the engine bay. Relay and Thermostat (obviously....) are clustered together in the engine bay. Thanks Edwin Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 20, 2009 Share Posted March 20, 2009 So none of the circuit diagrams to do exactly that in the fitting instructions floated your boat then? Quote Link to comment Share on other sites More sharing options...
Smokydiesel Posted March 20, 2009 Author Share Posted March 20, 2009 So none of the circuit diagrams to do exactly that in the fitting instructions floated your boat then? ....Ahhmmm no because all the different setups shown in the fitting instructions, need me to pull at least a wire from battery to the engine bay, another wire from the Thermostat (in the engine bay) back to the dashboard and from there back again to the engine bay......... I know I know.....perfectly good instructions supplied with the thermostat and still not happy Quote Link to comment Share on other sites More sharing options...
TD5 power Posted March 20, 2009 Share Posted March 20, 2009 hi it should be ok as long as the switch is suitably rated for the max fan current, i would also put a fuse rated to less than the smallest wire and the switch as close to the battery as possible. HTH matt Quote Link to comment Share on other sites More sharing options...
Logic Posted March 20, 2009 Share Posted March 20, 2009 ....Ahhmmm no because all the different setups shown in the fitting instructions, need me to pull at least a wire from battery to the engine bay, another wire from the Thermostat (in the engine bay) back to the dashboard and from there back again to the engine bay.........I know I know.....perfectly good instructions supplied with the thermostat and still not happy Hi Smokeydiesel The diagram you posted looks like it'll work, except you'll be pulling the full fan load through the on/off switch - fine if it's rated, but not ideal. It'd be better to take a light wire from the battery to switch, onto X-eng thermoswitch then onto the relay. Then run a heavier wire from battery direct to relay, then onto the fan (all appropriately fused of course - the switch & thermoswitch feed could be piggybacked off an existing circuit due to the relays extremely low loading). The negative can always be found in the engine bay. Just my thoughts Dennis Quote Link to comment Share on other sites More sharing options...
Smokydiesel Posted March 20, 2009 Author Share Posted March 20, 2009 Thanks all, I'm not to good with electrics and it shows ! Don't want to melt down my override switch, that's why there's a relay in the first place. Again thanks ! Edwin Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 20, 2009 Share Posted March 20, 2009 You only need take one wire to the switch - the ground wire from the relay coil. You can take that to a switch and the other side to the nearest ground (EG bodywork) behind the dash. It's low current (less than 0.5A) so almost any switch and wire will do. I wouldn't fancy running a leccy fan through a switch even if it was a rated 25A one as switches tend to get unreliable when worked near their current limit, and it'd be a lot of thick wire to run about the place. Quote Link to comment Share on other sites More sharing options...
tommobot Posted July 21, 2021 Share Posted July 21, 2021 Following on this topic, I have one of the X eng fans, and a old peugot twin fan arrangement that appears to shift a decent bit of air! With the twin fan, when the hi temp is activated on the x-eng sensor will both fans come on(1 linked to ultra hot and 1 to hot) I.e, lower temp setting 1 fan... higher temp both fans? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 21, 2021 Share Posted July 21, 2021 Yes. Unless you do something funky with the relays. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted July 21, 2021 Share Posted July 21, 2021 2 hours ago, Bowie69 said: Yes. Unless you do something funky with the relays. Freelander twin-fan relay lets both run at low-speed then high speed, I picked a couple up for about a tenner each, posted. Quote Link to comment Share on other sites More sharing options...
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