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Re: DC electrical System?
Posted: Wed Oct 14, 2009 2:46 pm
by paul213
why do you need to isolate the lighting coils from the frame? I was looking at an original 6v battery wiring diag and it uses both ac brown feed to h/lght rear light, and dc horn brake light and parking light both using the the frame for the -ve/return feed.
I want to try to understand because I want to restore a gp but fitting electonic ignition instead of points with the components hidden inside the original rectifier/reg cases.
Paul
Re: DC electrical System?
Posted: Thu Oct 15, 2009 1:09 pm
by firekdp
Paul, there are no problems when using a common earth for AC and DC on the original 6v system as they were two seperate supplies. The problem only arises when using a bridge rectifier, because if both the AC input and the DC output both connect to earth then one of the bridge diodes is effectively shorted out. This means that one half pulse is lost through this short and only leaves the other as a half wave output.
Re: DC electrical System?
Posted: Fri Oct 16, 2009 10:24 am
by paul213
I think Ive got the gist of that .
many thanks Paul
Re: DC electrical System?
Posted: Fri Oct 16, 2009 9:13 pm
by CANbus
IMO, after the hydraulic front disc brake this has to be next best modification I have done, the lights are bright as.
Re: DC electrical System?
Posted: Fri Oct 16, 2009 9:23 pm
by J1MS
firekdp wrote:Paul, there are no problems when using a common earth for AC and DC on the original 6v system as they were two seperate supplies. The problem only arises when using a bridge rectifier, because if both the AC input and the DC output both connect to earth then one of the bridge diodes is effectively shorted out. This means that one half pulse is lost through this short and only leaves the other as a half wave output.
Thats how I run two of mine. Using the rectifier as it really wasnt meant to be, this giving half wave rectification with a common earth. Simple, but possibly a little inferior.
Re: DC electrical System?
Posted: Tue Dec 29, 2009 8:02 pm
by Spud
Where can i get one of the podtronic units from?
Re: DC electrical System?
Posted: Tue Dec 29, 2009 9:54 pm
by soulsurfer
Spud wrote:Where can i get one of the podtronic units from?
Contact this guy for the Wassell unit, the same but half the price
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... K:MEWAX:IT
Re: DC electrical System?
Posted: Wed Dec 30, 2009 12:49 pm
by Spud
cheers soulsurfer
Re: DC electrical System?
Posted: Wed Dec 30, 2009 1:15 pm
by Spud
What is the general view, battery or not!
I am not going to run any extra lights, just want to have a horn that can be heard & lights to see.
+ a fuel gauge.
Re: DC electrical System?
Posted: Wed Dec 30, 2009 1:19 pm
by soulsurfer
I use one with a battery and one without, try it and see but may be sensible to use one with a fuel gauge.