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| Positive or negative earth? https://www.ausmini.com/forums/viewtopic.php?f=2&t=8314 |
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| Author: | David [ Tue Jun 21, 2005 6:03 pm ] |
| Post subject: | Positive or negative earth? |
Hello, Looking for some help here. I have a Sept 1968 Morris Cooper S (Aussie built Mk 1 - body number 5001). I have a radio to put in it set to negative earth. My mini has a generator. I have looked in the back and the negative terminal on the battery goes 15cm straight to the body, I suspect negative earth. Everyone else keeps saying if it has a generator it must be positive earth? My temp gauge is skits as well. Pulled it out and checked it, OK, new stabiliser, sender unit, but still reads out the roof. (Just off hot at 72 degrees with early opener thermostat). . Any ideas or advice would be greatly appreciated. . Dave - Sydney. |
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| Author: | FatMaserati [ Tue Jun 21, 2005 6:13 pm ] |
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If your negative terminal is going straight to the body, and there aren't sparks and fire and smoke coming from the engine bay, then it's definitely negatively earthed. Trust me, you'd know within seconds if it wasn't meant to be negatively earthed. |
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| Author: | GT1360 [ Tue Jun 21, 2005 6:15 pm ] |
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welcome to ausmini...
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| Author: | mini_me [ Tue Jun 21, 2005 6:17 pm ] |
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Hi David, Your car is negative earth.Generators can be either pos or neg earth. Check your temp gauge is connected properly. The regulator wire goes to the B connection on temp indicator and sensor wire goes to the T connection on indicator.If still no good try another sensor. Felix |
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| Author: | David [ Tue Jun 21, 2005 6:17 pm ] |
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Thanks for the reply so quick John and also for the welcome |
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| Author: | David [ Tue Jun 21, 2005 6:20 pm ] |
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Thanks felix, The radio I found is an original Diamond Dot unit and an old fella re built it for me. I am not keen on frying it. . I will look at the gauge wiring, but I will be honest in freely admitting I am crap with cars despite my efforts. . What is the earth strap between the clutch plate and solenoid (I think?) for? |
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| Author: | aussie [ Tue Jun 21, 2005 6:20 pm ] |
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i learnt my car was negative earth the other day when i was installing a cigarette lighter 
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| Author: | Morris 1100 [ Tue Jun 21, 2005 6:20 pm ] |
| Post subject: | |
All minis with generators were positive earth. It is very east to convert to neg earth and a lot of cars have been done. If your car has the neg post of the battery running to the body and everything is working fine I would say it has been converted. To convert the polarity of the genarator.... Quote: Flashing the Generator is what you have to do to change the polarity of the windings.
To do this, you run a wire from the positive post on the car's battery, to the large male terminal on the Dynamo. Touch the wire to the large terminal briefly, several times. Thats it! |
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| Author: | David [ Tue Jun 21, 2005 6:23 pm ] |
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Geez I should have found this site a long time ago, you guys (and gals) are a wealth of info. Anyone in the NSW mini car club? |
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| Author: | Morris 1100 [ Tue Jun 21, 2005 6:23 pm ] |
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FatMaserati wrote: If your negative terminal is going straight to the body, and there aren't sparks and fire and smoke coming from the engine bay, then it's definitely negatively earthed. Trust me, you'd know within seconds if it wasn't meant to be negatively earthed.
That is what happens to cars with alternators when they are hooked up the wrong way. Cars with generators are a lot different (no sparks)
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| Author: | Morris 1100 [ Tue Jun 21, 2005 6:30 pm ] |
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David wrote: What is the earth strap between the clutch plate and solenoid (I think?) for? Your engine is rubber mounted and without that strap you will not get the earth from the body to the engine. (except via the acelerator cable!)
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| Author: | David [ Tue Jun 21, 2005 6:32 pm ] |
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Ah, that makes sense. Are the temp and fuels gauges related in any way. As I said the temp gauge is crazy and ever since that has happened the fuel gauge only reads 3/4 when full? |
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| Author: | mini_freak72 [ Tue Jun 21, 2005 7:17 pm ] |
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definatley negative earth... if it was positive and you tried to put the negative to it, thene there may not be a mini to put it in just make sure you put all the correct wires/pulgs in the correct places |
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| Author: | min13k [ Tue Jun 21, 2005 9:00 pm ] |
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and dont connect up that diamond dot radio you will find it is pos earth unless ofcourse you want to let the genuine smoke out of it makka |
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| Author: | drmini in aust [ Tue Jun 21, 2005 9:10 pm ] |
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min13k wrote: and dont connect up that diamond dot radio you will find it is pos earth
unless ofcourse you want to let the genuine smoke out of it makka Depends how old they are. I worked for AWA- back in the early 70s you could get them and ours in either + or - earth.
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