Classic Mini Engine Parts
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 Posted: Jun 23, 2020 05:00AM
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Another interesting possibility is when using a trailer, or towing using a tow bar with a positive ground car, it will cause a short to the negative ground tow vehicle, if you don't disconnect the battery.

 Posted: Jun 22, 2020 07:04PM
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US
Quote:
Originally Posted by croc7
How does one jump start a positive ground car using a negative ground car?  
You'll find several descriptions online but they all boil down to the following.

NEVER let the cars touch each other.  
Ideally...
the Red/Orange jumper cable lead will go from the + terminal on the dead battery to the + terminal on the good battery.
the Black jumper lead will go from the - terminal on the dead battery to the chassis of the car with the good battery.

You don't let the cars touch each other and the last connection needs to be made AWAY from either battery.

Doug L.
 Posted: Jun 22, 2020 11:27AM
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US
Quote:
Originally Posted by dklawson
If you want to install any modern electrical or electronic convenience in your car it is more convenient to have negative ground.  

It is also safer giving or getting a jump start if both cars are of the same polarity.  If a modern car is giving or getting the jump start that means it is easier and safer if your car is negative ground.  Remember that most people trying to help you will never have seen or heard of a car with positive ground.
 
How does one jump start a positive ground car using a negative ground car?  The MG1100 is positive ground, so I guess that's information that I should have.

 

"To catch one, you need one"....John Cooper

 Posted: Jun 22, 2020 10:05AM
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US
If you want to install any modern electrical or electronic convenience in your car it is more convenient to have negative ground.  

It is also safer giving or getting a jump start if both cars are of the same polarity.  If a modern car is giving or getting the jump start that means it is easier and safer if your car is negative ground.  Remember that most people trying to help you will never have seen or heard of a car with positive ground.
 

Doug L.
 Posted: Jun 22, 2020 09:28AM
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Yes radio is the big one.

 Posted: Jun 22, 2020 06:43AM
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I guess a radio, but the main reason is an Alternator.

 Posted: Jun 22, 2020 04:53AM
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What are reasons for converting from positive to negative ground?
I have a 1966 Austin Cooper S.

Roger Williams
 Posted: Jun 21, 2020 01:39PM
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https://www.minimania.com/Electrical_polarity

"Retired:  No Job, No Money, Wife and I!  Will travel anywhere for Minis"

 Posted: Jun 21, 2020 12:42PM
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I have a 60 Morris Minor Traveller.  I want to know what is involved in converting it to negative ground.  Anyone know how to do this?
Thanks,
Darrell