The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: RoadRunner on 17.10. 2010 21:59

Title: Positive or Negative electrics?
Post by: RoadRunner on 17.10. 2010 21:59
Hi, for my Bitsa; basically a '57 Plunger Flash with A7 small finned iron top end which electrical system should I wire up - positive or negative? I don't have any wiring at present so before starting thought I'd try to get it right first time! I'm keeping it at 6v for the time being with a view to converting to DVR2 regulator (best option according to previous posts?) when finances improve! My dynamo and mag (man. adv/retard) have been reconned as standard. Intend using the original volt reg but have a brand new copy one incase.
Any advantage/disadvantage with either -ve or +ve system? Apologies if it's obvious *eek*

Cheers
RR
Title: Re: Positive or Negative electrics?
Post by: BSA_54A10 on 18.10. 2010 00:33
Not a cracker of differnce. nothing will work better & nothing will perform worse.
The change to + earth was done due to a big missunderstanding about electronic cathodic protection.
It works on ships because they are in salt water.
It dosn't wok on motor cycles because you can not get a complete circuit.

If you decide to change over, reverse the wires on the amp meter.
Also mark the battery box with a note "Negative Earth".
Title: Re: Positive or Negative electrics?
Post by: iansoady on 18.10. 2010 12:43
The only issue is when you have several vehicles with different layouts and you have to constantly remind yourself which is which.
Title: Re: Positive or Negative electrics?
Post by: Goldy on 18.10. 2010 16:59
I was in the same position with a choice of neg or pos and someone told me that if I chose postive earth I would not get any battery terminal corrosion, so positive it was and guess what, I get positive terminal corrosion.
Title: Re: Positive or Negative electrics?
Post by: BSA_54A10 on 19.10. 2010 01:02
Did some one mention incorrect application of electro galvanic corrosion protection ?
Title: Re: Positive or Negative electrics?
Post by: A10Boy on 21.10. 2010 13:57
No, I dont think so................ ;)