PeteT Posted March 31, 2017 Report Share Posted March 31, 2017 Hi Sage Ones, Having just converted to alternator and therefore neg earth I noticed the kenlowe had switched into reverse. Not something I had not thought about but easy to correct. My question is: is it likely the heater fan motor and wiper motor have done the same? Correcting the heater could be tricky due to access. Regards, Pete Quote Link to post Share on other sites
RogerH Posted March 31, 2017 Report Share Posted March 31, 2017 Hi Pete, the Rad fan is easily reversed by swapping over the it's two wires. This is handy as you can use the fan as a sucker or blower, depending on which side of the rad you want it. The heater and wipers are not affected by this, but very easy to test. Roger Quote Link to post Share on other sites
RobH Posted March 31, 2017 Report Share Posted March 31, 2017 (edited) It depends whether the motor has a permanent-magnet field or a coil-wound one. A PM motor will reverse direction with applied voltage because the polarity of the field magnetism is fixed but the armature magnetism reverses. A wound-field motor with internal connection won't because both the field and armature polarities change together. Both the wiper motor and heater fan motors have a wound field so will be OK as Roger says. It might make a difference in reversing the cooling fan direction if the blades are shaped rather than flat. If so they will work more efficiently in one direction. Edited March 31, 2017 by RobH Quote Link to post Share on other sites
TR24178 Posted March 31, 2017 Report Share Posted March 31, 2017 Changed my car to neg earth and the heater fan fan still chucks the heat downhill on to ones knees, felt lovely and warm last night as we attempted to do a navigational scatter with the local Motor club, light rain, wet map, knocked off the headlamps, early bath and a pint of Hobsons!! Quote Link to post Share on other sites
ianc Posted March 31, 2017 Report Share Posted March 31, 2017 Don't forget to swap the connections on the ammeter and those on the coil. Ian Cornish Quote Link to post Share on other sites
PeteT Posted March 31, 2017 Author Report Share Posted March 31, 2017 Thanks guys and please pardon my ignorance. Good news about the heater I dreamt last night that I had attached the earth wire right up where it's not now possible to get. I woke up in a cold sweat! Regards, Pete Quote Link to post Share on other sites
Lebro Posted March 31, 2017 Report Share Posted March 31, 2017 +1- what they all said, also, of course, the starter motor will always turn the correct way. Bob. Quote Link to post Share on other sites
Drewmotty Posted March 31, 2017 Report Share Posted March 31, 2017 As Rob said the cooling fan blade profile may be optimised for one direction. It is often possible to remove the fan blade assembly from the motor and turn it over to put things right. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted March 31, 2017 Report Share Posted March 31, 2017 TR2/3 Smiths original heater fan motor wil always work in the same direction of rotation regardless of the way the two wires are connected. I recently rebuilt a spare exchanged heater motor for a TR2/3 and tested. Peter W Quote Link to post Share on other sites
PeteT Posted April 2, 2017 Author Report Share Posted April 2, 2017 Few!! Many thanks guys. My kenlowe is a suck located on the back of the rad so now all is well. Suns out today so I feel another test run coming on. Regards, Pete Quote Link to post Share on other sites
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