Alan1 Posted November 22, 2015 Share Posted November 22, 2015 Does anybody have specific instructions on how to change polarity to negative earth please? Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted November 22, 2015 Share Posted November 22, 2015 Google is your friend......this is one of many hits I gothttp://www.classiccarprojectsh.....e-to-negative-earth/Only thing I would add is that the +ve and -ve battery posts are slightly different sizes so your clamps may not fit all that well afterwards. Depending on the type fitted it may be possible to swap them on the cables, fettle them to fit properly or you may need to replace them.Nick Quote Link to comment Share on other sites More sharing options...
Gt6s Posted December 8, 2015 Share Posted December 8, 2015 Read that link WHAT A LOAD OF COCK ! It is about ten years since I have done one but the reality is you really only need to change the battery terminals and flash the dynamo or even better BIN the dynamo and fit an alternator. OHH YES ! Bin or Ebay any positive earth radio.Laurence Quote Link to comment Share on other sites More sharing options...
heraldcoupe Posted December 9, 2015 Share Posted December 9, 2015 In addtion to what's mentioned in the link, you will need to reverse the connections to your heater blower, the motor is polarised and will spin backwards. It will still move air in the right direction, but the vanes on the blower drum are shaped so they're more efficient in the intended direction of rotation.Cheers,Bill. Quote Link to comment Share on other sites More sharing options...
Dave1360 Posted December 9, 2015 Share Posted December 9, 2015 I'm very wary of disagreeing with Bill on anything Herald-related, but that's certainly not the case with the Delaney Gallay heater motor. It will rotate the same direction irrespective of polarity. Having said that, the Smiths motors may well be reversible as I've seen stickers to that effect on a few MG heaters, but I've not played with a Herald one.Dave Quote Link to comment Share on other sites More sharing options...
heraldcoupe Posted December 10, 2015 Share Posted December 10, 2015 Quoted from Dave1360 that's certainly not the case with the Delaney Gallay heater motor. It will rotate the same direction irrespective of polarity. I don't have one to hand to check, but all those I've historically worked with have permanent magnet motors, both Delaney and Smiths. While I can't rule out a variant with windings in place of permanent magnets, it goes against the norm for a low-end motor,Cheers,Bill. Quote Link to comment Share on other sites More sharing options...
Dave1360 Posted December 10, 2015 Share Posted December 10, 2015 Interesting. I distinctly remember having to unsolder the field winding terminals from the brush plate doo-dah when I took mine apart. I'm fairly sure the old dead one was the same too.Dave Quote Link to comment Share on other sites More sharing options...
RobPearce Posted December 10, 2015 Share Posted December 10, 2015 I remember seeing an instruction to dealers (connected with customer reports of "running on") that strongly implied a change to permanent magnet motor in the heater. That might suggest there were some early cars with field windings? Quote Link to comment Share on other sites More sharing options...
heraldcoupe Posted December 10, 2015 Share Posted December 10, 2015 Quoted from RobPearce I remember seeing an instruction to dealers (connected with customer reports of "running on") that strongly implied a change to permanent magnet motor in the heater. That might suggest there were some early cars with field windings? It's certainly worth a follow-up investigation when I get the time. I've hoarded about a dozen D-G heaters, just a matter of finding the time.Cheers,Bill. Quote Link to comment Share on other sites More sharing options...
Bitumen Boy Posted December 11, 2015 Share Posted December 11, 2015 Quoted from Dave1360 ...that's certainly not the case with the Delaney Gallay heater motor. It will rotate the same direction irrespective of polarity. Dave It's a good few years now since I changed mine to negative earth, but I have a feeling that was the case with mine as well. Unless of course it had been the wrong way round to start with... Quote Link to comment Share on other sites More sharing options...
.thumb.jpeg.b15b81ef10abeea1c3039ae03c4a9f3a.jpeg)
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.