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Jun 14th, 2026
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Joined: Sep 2014
Posts: 201 Likes: 8
L - Learner Plates On
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L - Learner Plates On
Joined: Sep 2014
Posts: 201 Likes: 8 |
Guys, I am a little confused here? What several of you are typing about is by passing the temp sensor switch and there is mention of relays and switches that will carry the current involved (unless my head has messed up) there is only minimal current involved chaps as you are in effect bridging a SIGNAL wire not the high load feed wire.
If you were talking about switching direct feed to the motor then for sure you would be switching a high current feed but your not, your just talking about (and your spot on it is the correct way to do it) just putting an override switch into the signal wire that actuates the fan relay so all you need is a simple toggle switch.
I must have converted or supplied a mini harness for a dozen Morgan’s to do this and never had a problem or switch burn out. This however is not the case with later ECU controlled fans where great care should be exercised but fir the car under discussion all you need is 2 lengths of wire, a toggle switch, a few cable ties and a pair of piggy-back Lucar connectors. Takes about 30-45 min to complete the whole job. (Takes more time to mount the switch to be honest).
BR
Colin Hi Colin I appreciate this is a very old thread to resurrect, but is it OK to fit a fan bypass switch to a 2000 3.9 14CUX? Thanks Mike
Mike H
Bourgogne Franche Comté
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Joined: May 2009
Posts: 238 Likes: 3
L - Learner Plates On
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L - Learner Plates On
Joined: May 2009
Posts: 238 Likes: 3 |
Hi
Rather than running a couple of cables from the temperature switch all the way through the bonnet, I tied in a switch to the power supply to the fan relay (not the switching side of the relay)which is located next to the Starter relay just under the jack box on the drivers side of the scuttle, this gives 2 advantages 1) it’s much tidier & simple. 2) if the relay fails( quite common) then you have a built in bypass , which you don’t have if you link out the temperature switch - just make sure the switch is adequately rated
1999 Morgan Plus 8. 3.9 ....
1961 Alvis TD21 Series1 3 Litre Auto....
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Joined: Sep 2014
Posts: 201 Likes: 8
L - Learner Plates On
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L - Learner Plates On
Joined: Sep 2014
Posts: 201 Likes: 8 |
Hi
Rather than running a couple of cables from the temperature switch all the way through the bonnet, I tied in a switch to the power supply to the fan relay (not the switching side of the relay)which is located next to the Starter relay just under the jack box on the drivers side of the scuttle, this gives 2 advantages 1) it’s much tidier & simple. 2) if the relay fails( quite common) then you have a built in bypass , which you don’t have if you link out the temperature switch - just make sure the switch is adequately rated An interesting alternative, though have you put the switch in the cabin? I’m not too bothered about the relay, I’ve had one fail before so carry a spare. after a chat with Colin I’ve wired mine into the fan switch and the unused front foglamp switch, so at least have a bit of control over the temperature in traffic.
Mike H
Bourgogne Franche Comté
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