mcc1979ian Posted January 23, 2021 Share Posted January 23, 2021 Ok so went out to let the dog out last night around 11pm and heard like a fan sound from my 90. Popped the bonnet and find the Kenlowe spinning away. Unplugged the positive from the x switch and left it. Plugged back in this morning and straight away it starts spinning so for now it’s disconnected. Could this simply be a fault with the x switch or should I be looking elsewhere? Quote Link to comment Share on other sites More sharing options...
ThreePointFive Posted January 23, 2021 Share Posted January 23, 2021 Where are you taking the positive feed to the X Fan from? On my setup it would be possible for the manual 'on' side of the switch to be telling it to constantly run but the great thing about the X Fan is the flexibility of how it can be wired up, do yours may be entirely different. I am by no means electrically knowledgeable but I guess it's a case of breaking out the multimeter and working from the fan backwards. Sounds like it is the X Fan though. Quote Link to comment Share on other sites More sharing options...
simonr Posted January 23, 2021 Share Posted January 23, 2021 If it worked before, The thermostatic switch has failed. The most common reason for this is that it's switching too much current - and the contacts have welded themselves together! I would replace the 50091 type Thermostatic switch (which you can buy from most motor factors) and if it isn't already, connect the fan through a relay with a higher current rating than the 50091 (10A IIRC). Si 2 Quote Link to comment Share on other sites More sharing options...
mcc1979ian Posted January 23, 2021 Author Share Posted January 23, 2021 I could never find a definitive answer about wiring at the time so it’s wired direct to battery and we presumed the other 2 terminals were for the 2 speeds on the fan. Would anyone have a link to a wiring diagram of some sort Quote Link to comment Share on other sites More sharing options...
mcc1979ian Posted January 23, 2021 Author Share Posted January 23, 2021 Could this be what I needed back when I looked years ago Quote Link to comment Share on other sites More sharing options...
ThreePointFive Posted January 23, 2021 Share Posted January 23, 2021 That's the one, there are two versions on the Foundry site; the other is a manual control of one single fan and thermostat control of both. That's what I went for as I didn't want it to run straight from the battery in case of exactly this circumstance. The thermostat is only controlling a relay that takes the load from the fans (15amps each in my case!), so there shouldn't be the welding situation Si describes! Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 23, 2021 Share Posted January 23, 2021 To make it ignition-switched just move the feed for the relay: Quote Link to comment Share on other sites More sharing options...
Snagger Posted January 26, 2021 Share Posted January 26, 2021 On 1/23/2021 at 5:58 PM, simonr said: If it worked before, The thermostatic switch has failed. The most common reason for this is that it's switching too much current - and the contacts have welded themselves together! I would replace the 50091 type Thermostatic switch (which you can buy from most motor factors) and if it isn't already, connect the fan through a relay with a higher current rating than the 50091 (10A IIRC). Si Exactly how I installed mine. I think the instructions said the Intermotor thermostatic switch could handle a typical fan directly, but for the sake of peace of mind and longevity, a simple relay circuit costing about £5-6 and 30 minutes seemed prudent. It has been extremely reliable since fitting in 2008. As for the original question as to the cause of the problem, you’ll need to be methodical and test the circuit. It could be a disconnected wire shorting across terminals, a failed switch, or (if you did fit a relay) a failed relay. Quote Link to comment Share on other sites More sharing options...
mcc1979ian Posted November 17, 2021 Author Share Posted November 17, 2021 Switch changed and all ok now. Quote Link to comment Share on other sites More sharing options...
ThreePointFive Posted November 17, 2021 Share Posted November 17, 2021 Battery must be flat by now. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.