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How do you change +ve earth

 
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Skidmond
valued contributor


Joined: 18 Dec 2003
Posts: 1064
Location: Tasmania

PostPosted: Fri Nov 18, 2005 2:57 pm    Post subject: How do you change +ve earth Reply with quote

Hi all,

My 1000 two door is still positive earth and I want to change it to negative earth so I can fit other electrical items.

I have been told it is a relatively simple 'operation' to change it but dont know how.

Can anyone give me a step by step process of how to do it Mr. Green

thanks


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Andrew
3rd gear


Joined: 06 Sep 2005
Posts: 69
Location: Newcastle, NSW

PostPosted: Fri Nov 18, 2005 4:01 pm    Post subject: Reply with quote

CHANGE TO NEGATIVE EARTH

Changing a Morris to negative earth is not as difficult as you would think. If you follow this procedure you shouldn't get into much bother.

STEP 1.

Disconnect battery. Turn it around so that the negative terminal is aligned with the earth strap to the body. Leave disconnected

STEP 2.

Reverse the ammeter connections. Electric clocks, rev counters and the like may be a problem with polarity so seek advice from auto electricans if you have these fitted.

STEP 3.

Swap the leads on the coil, these leads will be marks SW & CB or (+) & (-).

STEP 4.

Fuel pump, heater fan and wipers are generally not polarity sensitive and therefore should run as normal

STEP 5.

If a radio is already fitted and is not a valve type, which is not affect by polarity, then change the polarity switch at the back, if fitted to negatve earth. If the radio is a positive earth type then you may have to change one that is negative earth.

STEP 6.

Chang polarity of a genterator :-

a) Disconnect leads on regulator "F" and "D"

b) Connect the battery, positve to starter negative to body

c) Stoke the field terminal wire "F" lead across the main battery feed terminal, marke "A" on the regulator. Do this about 5 times at one second intervals creating a spark each time. This will reverse the polarity of the dynamo or generator and is called "Flashing the Poles"

d) Reconnect the "F" & "D" leads to the regulator

e) Start the engine and check the ammeter is indicating the generator is charging correctly


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Skidmond
valued contributor


Joined: 18 Dec 2003
Posts: 1064
Location: Tasmania

PostPosted: Fri Nov 18, 2005 5:20 pm    Post subject: Reply with quote

Thanks Andrew, I will have a go at it on the weekend Mr. Green


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RussLCV
moderator


Joined: 11 Sep 2003
Posts: 536
Location: Cardiff WALES

PostPosted: Mon Nov 21, 2005 5:52 am    Post subject: Reply with quote

Oh.......................lastly STAND WELL BACK!!!!!!


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bigginger
I can steer now


Joined: 24 Aug 2005
Posts: 187
Location: Somerset, Britain

PostPosted: Mon Nov 21, 2005 8:23 am    Post subject: Reply with quote

Prrobably not Very Happy but do be certain that the positive terminal CAN"T touch the holding strap when you turn the battery around, either by insulating or adapting the strap. You may need to change the earth lead to the body, as the clamps are often different sizes (over here, anyway).


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