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Author Topic: + vs - ground (earth)?  (Read 1192 times)

Offline Grammabud

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+ vs - ground (earth)?
« on: 22.01. 2014 20:03 »
Most all 12V vechicles are negative ground.

I believe all a7s and a10s were originally positive ground.
 
I'm planning a switch to a DVR2 regulator for my 1960 A7.
Is there any reason to switch to Neg. ground ?

What are the pro's & con's?
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Offline Grammabud

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Re: + vs - ground (earth)?
« Reply #1 on: 22.01. 2014 22:25 »
NEVER MIND...I answered my own question.
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Offline KiwiGF

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Re: + vs - ground (earth)?
« Reply #2 on: 23.01. 2014 03:30 »
The dvr2 can cater for - or + ground, you just need to order the right one to suit your bike. But I think you have worked that out already?

One good feature is you csn configure the dvr2 for 6 or 12v so in my case if I upgrade to 12v I do not have to buy another dvr2 unit.
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New Zealand

1956 A10 Golden Flash  (1st finished project)
1949 B31 rigid “400cc”  (2nd finished project)
1968 B44 Victor Special (3rd finished project)
2001 GL1800 Goldwing, well, the wife likes it
2009 KTM 990 Adventure, cos it’s 100% nuts

Online muskrat

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Re: + vs - ground (earth)?
« Reply #3 on: 23.01. 2014 09:02 »
I have gone 12v through DVR2 and V-reg on both my A's and left them +ve to save confusion (lots of that in my shed).
I'm not sure if it makes a difference if you want to use led globes  *dunno*.
What happens if a +ve bike touches a -ve bike? Will sparks fly? I park the BSA very close to the rHonda.
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
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Offline Grammabud

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Re: + vs - ground (earth)?
« Reply #4 on: 23.01. 2014 12:37 »
I assumed, if converting to 12V., it would be better to have (-) ground and be like all other 12V vehicles.
Just wanted to know what others have experienced.

I really LIKE this forum!
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Offline a10 gf

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Re: + vs - ground (earth)?
« Reply #5 on: 23.01. 2014 13:03 »
Search google for some interesting info about + grounding > example. Some posts about it here on the forum somewhere.
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Online bsa-bill

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Re: + vs - ground (earth)?
« Reply #6 on: 23.01. 2014 18:50 »
I seem to remember something way back about Pos earth being better for deposition on contact points (never understood this as surely deposition would just shift from one point to the other)
However if there were some truth in this theory then it would be negated for electronic ignition so for that Pos earth would be the norm.
Doubt if it makes one iota of difference on a 60 year old A of dynamo type, altanator would be a different thing thogh with a zenner involved and as has been mentioned LEDs of course for the same reason.
But we live in a world of ever changing theories
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All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco
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