How do i make it a negative earth car ? the car has a generator not a alternator
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| Radio in a + earth car =smoke https://www.ausmini.com/forums/viewtopic.php?f=2&t=55315 |
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| Author: | moovan [ Mon Jul 20, 2009 6:56 pm ] |
| Post subject: | Radio in a + earth car =smoke |
| How do i make it a negative earth car ? the car has a generator not a alternator
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| Author: | 850man [ Mon Jul 20, 2009 7:06 pm ] |
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turn the battery around & re polerize the generator by removing the regulator box cover & give the little arm a few pokes. |
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| Author: | drmini in aust [ Mon Jul 20, 2009 7:19 pm ] |
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850man wrote: turn the battery around & re polerize the generator by removing the regulator box cover & give the little arm a few pokes.
And you should swap the coil primary leads around too. Otherwise electrical folklore says the coil will give less voltage. |
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| Author: | 64cooper [ Mon Jul 20, 2009 7:20 pm ] |
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check out the 'How to' http://www.ausmini.com/forums/viewtopic.php?t=27591 If you don't want to keep the generator then change to an alternator at the same time as you do the polarity reversal. As Matt the miniman is oft to say, easy peasy. |
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| Author: | 850man [ Mon Jul 20, 2009 7:22 pm ] |
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drmini in aust wrote: 850man wrote: turn the battery around & re polerize the generator by removing the regulator box cover & give the little arm a few pokes. And you should swap the coil primary leads around too. Otherwise electrical folklore says the coil will give less voltage. Yeah, do that too 
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| Author: | drmini in aust [ Mon Jul 20, 2009 7:24 pm ] |
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You don't HAVE TO convert to an alternator to get negative ground. It really is as easy as 850man says. He didn't specify which arm though...  you push the cutout arm in, hold for a few secs then let go. Make sure it comes back out, if not, use a screwdriver..
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| Author: | moovan [ Mon Jul 20, 2009 8:16 pm ] |
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will the fuel and temperature gauges still be ok?? |
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| Author: | drmini in aust [ Mon Jul 20, 2009 8:18 pm ] |
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moovan wrote: will the fuel and temperature gauges still be ok??
Yes. |
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| Author: | Drexxle [ Mon Jul 20, 2009 8:24 pm ] |
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if stereo plus dodgy wiring === smoke you might want to check the fuse inside the stereo head unit. |
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| Author: | blue_deluxe [ Mon Jul 20, 2009 8:27 pm ] |
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Its only things with diodes inside them that will not function with pos earth. You cant easily run a current through a diode backwards. |
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| Author: | Drexxle [ Mon Jul 20, 2009 8:30 pm ] |
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depends on the head unit. new units tend to be a little more sophisticated, and there was smoke, which obvisouly means current went somewhere. |
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| Author: | TheMiniMan [ Mon Jul 20, 2009 9:36 pm ] |
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Lucas generator systems are "Self pole-ing" (spelling?) all you need to do is swap the battery around, swap the coil wires around,,, then just simply turn the ignition on,,, job done,,,it`s now ready to run neg earth simple as that |
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| Author: | drmini in aust [ Mon Jul 20, 2009 10:01 pm ] |
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TheMiniMan wrote: Lucas generator systems are "Self pole-ing" (spelling?)
all you need to do is swap the battery around, swap the coil wires around,,, then just simply turn the ignition on,,, job done,,,it`s now ready to run neg earth simple as that You can say this Matt, but back in 1967 I found it wasn't so. I had to close the cutout to reverse the polarity, it would not charge until I did this. |
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| Author: | Mick [ Mon Jul 20, 2009 10:15 pm ] |
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Yep, it's called "Striking (or flashing) the field". There's a small amount of permanent magnetism stored in the iron within the generator which creates a small current when the genny starts spinning on startup, this small amount of current seeds a larger magnetic field which in turn creates a larger current flow. It's a case of a small amount of residual magnetism seeding the charge process, also called "self excitation" The poling of the generator (direction of the north and south poles, like in a normal magnet) decides which direction the current will flow initially and hence decide the polarity of the car. Nothing needs to be done to the regulator, it does not care for the polarity, neither does the starter motor which will turn in the same direction anyway, or the instruments. Third way of flashing the field is to (with the engine and ignition turned off): - Disconnect the large and small spade terminals on the generator, - Turn the battery around in the boot and reconnect, - with a short length of wire from the battery post on the solenoid, strike the field terminal of the generator (the small spade marked F) two or three times like you would strike a match. This reverses the magnetic pole within the generator, it will spark a little...don't worry. - Reconnect the large spade and field wire, - Start the engine. A 5 minute job. (oh, and flip the ignition coil wires too for good measure...) Sometimes the old generators lose their magnetism. Striking the field will restore this residual field again. |
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| Author: | bnicho [ Mon Jul 20, 2009 10:24 pm ] |
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I blew up a cheap new stereo in my first Mini in 1990 that way. I got an exchange unit from the shop and then realised my mistake. I didn't have a clue about reversing the polarity back then, so I built a plywood box to insulate the radio from the body.
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