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#98285 - 08/12/06 8:36 pm earthing, again  
Joined: May 2006
Posts: 148
TriVin Offline
BritBike Forum member
TriVin  Offline
BritBike Forum member

Joined: May 2006
Posts: 148
Warrington, Cheshire, UK
Just got back to the rebuild after my hols.
Got my nice new painted rear mudgaurd and number plate on. Tried to get the back light to work but no luck. Remembering my lack of electrical knowledge now chaps, should the fitting be earthed properly for it to work. That is, the paint scraped away etc at all the bolted connections to get back to the frame or is this another case of running a dedicated earth wire back to the single point connection that I have created, following all the tips previously mentioned by RF and the rest of the gang?
My rear light fitting has 2 wires coming from it. Red and black. Which is usually the brake light? Or are both elements in the bulb the same anyway, so that it matters not?

Dave cool

1966 Tiger 100SS


Dave
Tiger 100SS 1966
T120V 1972
Vincent Comet 1952
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#98286 - 08/12/06 8:57 pm Re: earthing, again  
Joined: Jul 2005
Posts: 1,919
John RGS Offline
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John RGS  Offline
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Joined: Jul 2005
Posts: 1,919
new jersey usa
The red should be the brake on aftermarket stuff. With no ground lead, the housing should be grounded. Best to attach a ground to the light socket and run a lead to your ground connection.


,_o
_ -\_<,
(*)/'(*)

NOPGS #2
#98287 - 08/12/06 10:35 pm Re: earthing, again  
Joined: Oct 2003
Posts: 11,108
RF Whatley Online content
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RF Whatley  Online Content
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Joined: Oct 2003
Posts: 11,108
North Georgia, USA
Dave -
What John is telling you is true AND much better than scraping paint off 100 parts to try and get some kind of "grounding".

Within the stock wiring (I assume your bike is stock or at least comforms to stock as far as the electrical sys and tail lamp are concerned) Lucas ran a ground wire to everything except the tail lamp. This is really a shame since the tail lamp is what keeps you from being run over and you've only got 1. So the tail lamp needs to be 100% operational all the time. Any "down time" can get a guy killed! eek

On my 1966 I made a new wire which runs from the SPG (base of the rectifier) to the tail lamp. It runs next to the stock 2-wire harness back to the tail lamp and goes through the same grommets. If you'll make this new wire in black, it will be almost invisible. Some small black cable ties make it behave under the fender.

BTW... The same wire that's supposed to ground the tail lamp also grounds the engine (points and spark plugs). So your lack of tail lamp is telling me that your engine performance may be suffering too. IMHO you ought to run another wire from the SPG up to the highest head bolt under the tank.

Hope this helps! bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#98288 - 08/13/06 9:29 am Re: earthing, again  
Joined: May 2006
Posts: 148
TriVin Offline
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TriVin  Offline
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Joined: May 2006
Posts: 148
Warrington, Cheshire, UK
Thanks guys. After reading all the other posts on this subect I was hoping that these were going to be the answers to my question. Its logical really but what puzzled me was the exact point that RF made about the harness. Since this is a rebuild I of course purchased a new harness. 'No earth wire to the rear end! Unlike the front end. Just 2 bullet connectors ending at the battery area. Grrrhh!
The line to the head is in already but of course I have not tried to start it up yet. Soon though!

Thanks

Dave


Dave
Tiger 100SS 1966
T120V 1972
Vincent Comet 1952
#98289 - 08/13/06 9:26 pm Re: earthing, again  
Joined: Oct 2003
Posts: 11,108
RF Whatley Online content
BritBike Forum member
RF Whatley  Online Content
BritBike Forum member

Joined: Oct 2003
Posts: 11,108
North Georgia, USA
I actually terminated my tail lamp "ground wire" on the underside of the fender, there where the front stud from the tail lamp housing comes though the fender. It was a "quick and dirty" just to get through the summer since the fenders are coming off for paint in October anyway. But the location seems to work just fine.

bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes

Moderated by  John Healy 


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