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Negative or positive earth?

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keithb

Post subject: Negative or positive earth?

Posted: Sat Jun 01, 2013 10:05 pm

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Joined: Wed Dec 05, 2012 3:22 pm
Posts: 52
Location: Sydney Northern Beaches

Hi
Pretty dumb question but would my 65 roundie be positive or negative earth?It's running an alternator.
Thanks

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Timbo

Post subject:

Posted: Sat Jun 01, 2013 10:19 pm

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Joined: Mon Sep 12, 2005 11:48 pm
Posts: 1842
Location: Hobart, Tasmania

It would have been positive earth originally but if its running an alternator now its most likely negative earth.

Tim

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peterb

Post subject:

Posted: Sun Jun 02, 2013 8:21 am

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Joined: Sat Jul 23, 2011 8:17 am
Posts: 1964
Location: san remo nsw

Timbo's right, alternators are negative earth, generators can be either.

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drmini in aust

Post subject:

Posted: Sun Jun 02, 2013 9:11 am

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39754
Location: near Baulkham Hills, NSW

The other advantage of neg earth is that modern transistorised radio head units can be used.

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Convertible Mini

Post subject: Pos or Neg

Posted: Sun Jun 02, 2013 4:25 pm

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Joined: Thu Dec 09, 2004 6:57 am
Posts: 3022
Location: JIMBOOMBA QLD.

Alternators are mainly Negative earth. I have only ever come across one car that had positive Earth and ran an Alternator. This was the Datsun Fairlady. Very hard to find Alternator parts for them.

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drmini in aust

Post subject:

Posted: Sun Jun 02, 2013 6:53 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39754
Location: near Baulkham Hills, NSW

English Lucas 11AC alternator was positive earth, but afaik we never got them here. The first ones used in Oz were the 15AC which were neg earth, as are all later ones.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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John Smidt

Post subject:

Posted: Mon Jun 03, 2013 5:24 pm

The Mini King

Joined: Mon May 21, 2007 7:20 pm
Posts: 1338
Location: Windsor, NSW

If You are thinking of putting the lucas11AC alternator on so you can stay positive earth,Be very careful because most Lucas 11AC alternators are negative earth
so please do not think if You buy a Lucas 11AC alt that it will be positive earth.
make sure You ask the question before Buying

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winabbey

Post subject: Re: Negative or positive earth?

Posted: Mon Jun 03, 2013 5:43 pm

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Joined: Wed Oct 03, 2007 9:04 pm
Posts: 6750
Location: Melbourne, VIC

keithb wrote:

Hi
Pretty dumb question but would my 65 roundie be positive or negative earth?It's running an alternator.
Thanks

Just to be sure, have a look at the battery to see whether the positive or negative terminal is grounded.

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keithb

Post subject:

Posted: Mon Jun 03, 2013 6:49 pm

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Joined: Wed Dec 05, 2012 3:22 pm
Posts: 52
Location: Sydney Northern Beaches

Thanks guys. It is negative
Cheers

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Mick

Post subject:

Posted: Mon Jun 03, 2013 8:50 pm

SooperDooperMiniCooper ExpertEngineering

Joined: Fri Apr 29, 2005 9:46 am
Posts: 18887
Location: Under the bonnet son!

keithb wrote:

Thanks guys. It is negative
Cheers

Which is more of a positive than a negative really.

:wink:

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All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

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winabbey

Post subject:

Posted: Mon Jun 03, 2013 8:53 pm

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Joined: Wed Oct 03, 2007 9:04 pm
Posts: 6750
Location: Melbourne, VIC

Mick wrote:

keithb wrote:

Thanks guys. It is negative
Cheers

Which is more of a positive than a negative really.

:wink:

Dad's joke :roll:

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

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Mick

Post subject:

Posted: Mon Jun 03, 2013 9:06 pm

SooperDooperMiniCooper ExpertEngineering

Joined: Fri Apr 29, 2005 9:46 am
Posts: 18887
Location: Under the bonnet son!

I never thought I would become one of those dads...

:lol:

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All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

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frednutz&co

Post subject:

Posted: Mon Jun 03, 2013 10:00 pm

1275cc

Joined: Sat Jun 09, 2007 2:01 pm
Posts: 3293
Location: melbourne ferntreegully

all dads are it is in the rule book

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winabbey

Post subject:

Posted: Mon Jun 03, 2013 10:15 pm

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Joined: Wed Oct 03, 2007 9:04 pm
Posts: 6750
Location: Melbourne, VIC

frednutz&co wrote:

all dads are it is in the rule book

Spoken like a true Dad

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VMCI #43

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