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billt
I've got trainer wheels


Joined: 14 Jun 2006
Posts: 17
Location: Canberra

PostPosted: Sun Jun 21, 2009 8:03 pm    Post subject: Positive to earth Reply with quote

Have a 1958 Morris 1000, how can I tell if the battery connections are positive to earth .Will the car start if I connect the battery wrong?
Bill T


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Scouse
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Joined: 15 Sep 2003
Posts: 5266
Location: Wollondilly, NSW

PostPosted: Sun Jun 21, 2009 9:13 pm    Post subject: Reply with quote

The car will start whichever way the battery is fitted but any accessories might not like it.
In another thread, you mention the car is lowered. Therefore, I would assume it's also had a radio fitted at one stage. If so, then it's 99% likely to have been converted to -ve earth (+ve earth radios are rare).
Also, if it has an alternator, it will be -ve earth.

In theory, you should be able to tell by the coil connections but that's not a definite as the coil will work either way round.


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Tadhg
Got the hang of this ...


Joined: 26 Jun 2006
Posts: 250
Location: Toowoomba

PostPosted: Mon Jun 22, 2009 12:12 am    Post subject: Reply with quote

I found that (coil will work earthed the opposite way to the battery) out recently... Mad Installed one of the cheap Electronic Ignition kits from eBay into my Mini, and fried it... It'd been converted to -ve earth, but the coil was still +ve earth. Eye Rolls Points work both ways, electronic ignition doesn't. Eye Rolls Once I fixed the earth arrangement (swapped the coil's polarity), and installed a replacement module, it worked. For about $50, not bad... Very Happy


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Hoary Morrie
Got the hang of this ...


Joined: 07 Sep 2004
Posts: 247
Location: Brisbane

PostPosted: Mon Jun 22, 2009 1:45 pm    Post subject: Reply with quote

I thought you could also use the theory put the bigger battery terminal on the larger terminal, and the smaller on on the other.


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billt
I've got trainer wheels


Joined: 14 Jun 2006
Posts: 17
Location: Canberra

PostPosted: Mon Jun 22, 2009 7:37 pm    Post subject: Reply with quote

Thanks for your help. It does have a radio,temp guage.ampmeter and tacho none of which work. Maybe if I connect the battery leads negative to earth they may work. The car is at Dads place so wont be able to try until weekend.
Thanks again BillT.


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Scouse
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Joined: 15 Sep 2003
Posts: 5266
Location: Wollondilly, NSW

PostPosted: Mon Jun 22, 2009 9:59 pm    Post subject: Reply with quote

If it has accessories like you've described, it'll be -ve earth.


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frosty
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Joined: 23 Dec 2003
Posts: 3829
Location: 4559 near a big pineapple, Qld

PostPosted: Tue Jun 23, 2009 9:37 am    Post subject: Reply with quote

billt wrote:
.... have a radio,temp guage.ampmeter and tacho none of which work. .


Could be that they've already been cooked by the wrong polarity


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