d.p.n.s Posted October 22, 2011 Share Posted October 22, 2011 hi all from my understanding the mk2 zephyr is positive earth and seeing as its all stripped out. i have started to put the full loom back in . is it as easy as just chaging the earth to negitive? seeing as there is no electrics hocked up at the moment cheers dan Quote Link to comment Share on other sites More sharing options...
tortron Posted October 22, 2011 Share Posted October 22, 2011 1. Switch off ignition 2. Disconnect the battery and turn it round the other way. Cut two 'U' sections from the metal bracket that retain the battery so it has adequate clearance from the terminals. 3. Replace the two terminals on the battery leads (the positive and negative terminals are different sizes). New ones are available from any good car shop. 4. Connect the earth connection to the battery negative terminal. 5. Disconnect both dynamo leads and use a long length of wire to connect the small dynamo terminal to the battery positive for five to ten seconds. This removes any magnetic memory that the dynamo has so it charges the correct way. 6. Re-connect the dynamo. 7. Connect the positive lead to the battery. 8 Swap the 2 small wires on the coil over. These just pull off and slide back on. If in doubt you should end up with the black and white wire connected to the terminal marked - or neg. 9 If the red light on the dash goes out when the engine is running all is well. If not repeat sections five onwards. 10 If you have one of the very early cars with an ammeter you will need to reverse this as well or it will read backwards. Some of the very early cars have heaters that run in reverse as well but only the VERY early cars do this. The windscreen wiper motor also runs the opposite way but this has never proved a problem. (thanks to the mmoc) Quote Link to comment Share on other sites More sharing options...
d.p.n.s Posted October 22, 2011 Author Share Posted October 22, 2011 sweet thanks for that. Quote Link to comment Share on other sites More sharing options...
governorsam Posted October 22, 2011 Share Posted October 22, 2011 will need to reverse thisas well or it will read backwards. Quote Link to comment Share on other sites More sharing options...
DangerousPerson Posted October 22, 2011 Share Posted October 22, 2011 Just curious but why did cars ever come with positive earth/ why did they change to negative? Quote Link to comment Share on other sites More sharing options...
cubastreet Posted October 22, 2011 Share Posted October 22, 2011 It's a chemistry thing. not my best subject but when iron oxidizes the oxygen takes electrons from it. negative earth floods the iron with electrons making it harder to rust. I'm sure someone can explain better but that's how I understand it Quote Link to comment Share on other sites More sharing options...
sholdowa Posted October 23, 2011 Share Posted October 23, 2011 I can post them up a bit bigger if this isn't readable... Quote Link to comment Share on other sites More sharing options...
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