April 14, 2020
Tried searching the faq's... nowt. With my 59 D7's light switch to the right, I have to have fairly high revs to get headlight... and the rear bulb is almost non existent. Also there is no brake lights at all. With the switch to the left, the front pilot light is fine but no brake light. I can't find anything useful in my manual or handbook... Any advice please.
November 6, 2016
August 27, 2013
There is only a finite number of watts available from a D7’s generator. If a previous owner has fitted too high a wattage headlight bulb, there will be insufficient power to drive it, and consequently not enough left to illuminate the tail lamp either. You need a 25/25 W headlight bulb as a maximum really.
The brake light is powered from the battery, and should work without the engine running, or the ignition on.
January 9, 2013
hi Bob the D 7 have odd eletrics as you will see , it sounds like your D7 has mix of D modle systems so its inporant to identify wot generator and harnes it has thay as dont mix well so please read DUCON tips in F A Q and search [ top left ] the SPEC number thats on the generator and use the Privet Mesaging system we have as a club to reach me
February 7, 2013
Have you owned the bike long, and has it always been like this ?
On my project D1 I wired a loom into a period single ignition/ light switch, and discovered the same 'features' you describe when first operating the nonstandard Switchgear I had installed.
The 'strange' functionality was traced to an incorrect cross wiring connecting issue I had made, and by junking the pattern D1 switch. So might be worth you checking the condition of your switches terminal end connections, and the loom against a wiring diagram.
I wired negative earth in the end, but lighting performance was improved by cabling in both positive and negative wires to the lights, and in my case all those earth's were run & met at a single frame point, under the saddle.
A mate demonstrated the lighting improvement to me by showing a ' before and after,' when I assumed there would be no improvement achieved by running power cable to the lights, and trying to complete the circuit via the frame locally.
June 23, 2013
Tried searching the faq's... nowt.
Have you looked elsewhere? ** Please log in to view **
Is it magneto or coil ignition?
Don' forget it's a 62 year old bike with a generator giving about 50 Watts when in top form. Do you have all original specification bulbs fitted? Otherwise you may be overloading the system. Most problems have been discussed, though the D7 has a variety of wiring options so you need to be sure of what you have.
You also need to know how you should be operating it.
January 18, 2020
Dare I mention LED's – good quality LED 'bulbs' are available from Classic Car Leds – lots of brightness from negligible current, compared to filament bulb equivalent. Positive and negative earth, 12V and 6V, and maybe even bi-directional, at least hr sold me a couple like that.
Mike H --
Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.
Most Users Ever Online: 223
Currently Browsing this Page:
Cornish Rooster: 2917
Blue Heeler: 2434
David Dale: 2144
Sprung Chicken: 2121
Mags 1: 1753
mike p5xbx: 1688
Guest Posters: 1367
Administrators: Bantam-Super, JMD, Stoo63