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Changing wiring from positive earth system to neg earth syst
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kenladdie



Joined: 19 Sep 2009
Posts: 1
Location: Queensland Australia
PostPosted: Tue Oct 06, 2009 12:59 pm    Post subject: Changing wiring from positive earth system to neg earth syst Reply with quote
I am not sure on electrical wiring for the older cars..I am considering changing my 1953 MG magnette from positive earth to negative earth..Can anyone tell me if reversing the terminals on the battery and what other connections do I need to reverse. Will the electric fuel pump etc still work correctly and do I need to change anything else?..Is there any written info available anywhere?...anyones advise would be most appreciated...thenks...Ken
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traction39



Joined: 19 May 2009
Posts: 399
Location: South Wales
PostPosted: Tue Oct 06, 2009 2:15 pm    Post subject: Reply with quote
There is quite a lot on the web concerning this:

check this site (specific to MGA but the idea is the same):

http://mgaguru.com/mgtech/electric/et202.htm

Bear in mind that your clock if electric will not work....and your fuel pump may not be polarity sensitive..
_________________
Alistair

Citroen Light 15 1953, "12" 1939,
Riley 9 Special 1932
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47Jag



Joined: 26 Jun 2008
Posts: 1480
Location: Bothwell, Scotland
PostPosted: Wed Oct 07, 2009 12:25 am    Post subject: Reply with quote
If the fuel pump is original (IE doesn't have a stepped cap with the capacitor inside) it will be OK. Likewise the clock. Smiths clocks aren't polarity sensitive. You will have to reverse the coil connections and re-polarize the dynamo (known as flashing). Any transistorised add-ons will be affected.

Art
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ukdave2002



Joined: 23 Nov 2007
Posts: 4104
Location: South Cheshire
PostPosted: Wed Oct 14, 2009 1:59 pm    Post subject: Reply with quote
Ken

I was wondering why you wanted to make the change ?

Dave
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