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 Post subject: Positive Earth
Posted: Tue Feb 19, 2008 4:54 pm 
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I got an xp and it has +earth, and i would like to know how to get my cd player working, cause i heard that it sets up differently

 

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Posted: Tue Feb 19, 2008 7:01 pm 
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I don't know 100% - never done it before.

But, as a guess...

- fully insulate the case so it can't possible earth to the car body. THIS IS IMPORTANT the case of the head unit will be negative earth.
- carefully wire up the neg and + to it.

 

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Posted: Tue Feb 19, 2008 8:23 pm 
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Assuming its still Generator and solenoid style regulator then rewire it for -ve earth, do a search old mini's used to be easily changed.

 

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Posted: Tue Feb 19, 2008 9:07 pm 
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I agree with twason that it can be done.
When I bought an XP through the Toyota dealer I worked for in 1969, it was already converted to use a negative earth Toyota alternator. The workshop manager had owned it and he said it wasn't hard to do, unfortunately I don't have the details of what he did.
Cheers,
Paul

 

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Posted: Tue Feb 19, 2008 9:14 pm 
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lol, i never heard of this technology before. WTF were the engineers at the time thinking??

 

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Posted: Tue Feb 19, 2008 9:42 pm 
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Well all it was, was a convention. Most people associate Earth with -ve, probably 'common' is the better word to use. Years ago it was quite common - particularly on pommy cars IIRC.
Easiest is a google search - here's one to start off:
http://www.fordconsul.co.uk/convertingtonegative.htm

 

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Posted: Tue Feb 19, 2008 10:14 pm 
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smiley235 wrote:
lol, i never heard of this technology before. WTF were the engineers at the time thinking??


like others have said mainly the brit cars


but to save the hassle of rewire...

just insulate the deck completely and wire as normal
BUT use the chassis as +

 

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Posted: Wed Feb 20, 2008 12:34 am 
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be careful with screws holding the thing too, need a way of isolating them as well...

also how the fck does that work with accessories and ignition? might need a relay to sort that...
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Posted: Wed Feb 20, 2008 1:09 am 
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Car antennas use the body as the field for the radio, so there is a good chance that the outer part of the antenna plug is actually positive as well. If you are going to install the -ve earth deck into +ve earth car, you have to isolate everything, body of the deck, outside of the antenna most be insulated from the deck as well or it will short.


rgds

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Posted: Wed Feb 20, 2008 7:26 am 
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oh snap, hadnt even thought of that, but yeah, it will probably sound like s**t using the radio...

might be better long term to change it to -ve earth... probably not much more work considering everything you have to worry about
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Posted: Wed Feb 20, 2008 2:00 pm 
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so even though it seems like a big job to change it to + earth and no idea how the f..k it works, actually its fairly simple to do from the sounds of it

 

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Posted: Wed Feb 20, 2008 2:13 pm 
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A quick google of the subject found me these urls.

http://www.mgcars.org.uk/midgetspritecl ... osNeg.html

http://www.lotus-cortina.com/electric/convert.htm

There were others as well.

should help with the general requirements.


rgds

Frank
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Posted: Wed Feb 20, 2008 8:17 pm 
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WELL IAM NOT CONNECTING THE ANTENNA CAUSE ALL I WANT TO DO IS HAVE MY MP3 PLAYER PLAYING MUSIC....

SO IF IT SEEMS A PAIN ME ASKING NOW THAT IS THERE SOME OTHER WAY EVEN BY REMOVING THE RADIO ALL TOGETHER AND JUST HAVE THE MP3 PLAYER CONNECTED TO CIG' LIGHTER AND THEN JUST SPEAKERS WITH SOME SORT OF AMPLIFIER,,, CAUSE I KNOW IT WONT MAKE MUCH NOISE IF ITS 6 by 9 SPEAKERS STRAIGHT TO MP3 PLAYER

 

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Posted: Wed Feb 20, 2008 9:02 pm 
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i'M SURE AN AUTO-ELECTRICIAN MIGHT BE ABLE TO TELL YOU FOR A PRICE. THAT'S YOUR BEST OPTION IF YOU DON'T LIKE THE ANSWERS YOU'VE GOT. WE
SEEM TO THINK THE EASIEST WAY IS TO GO TO A NEGATIVE EARTH SETUP.

 

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Posted: Thu Feb 21, 2008 8:38 pm 
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HAHAA yeah i no its prob for the best cause of all the positives (pardon now it being the topic of negative)
i now know my options i guess i'll get right on it when the car comes back..

thank you all

any more Q's just let me know

 

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