Could someone take the cover off a D3 150 bantam major generator and post a photo so I can see where everything fits and all the wires go.
also where does the horn, coil and the rectifier bolt on. your help will be much appreciated.
Kelvin
I think the D7 shown below is basically eh same layout.
AWJDThumper
Thankyou for your fast reply this picture gives me all the information I need.
I wonder if you could let me know where the horn, rectifier and the coil goes.
Your help has been great.
Kelvin.
Hi Kelvin. I'm not an expert on D3 Bantams but as far as I can see they used magneto ignition. If that was the case then the little coil shown in the drawing above would have been the magneto coil which should connect directly via a HT lead to the spark plug. I believe it was the D7 model that first used coil ignition.
If the wiring from this coil is the same as in the diagram above then this would imply it is coil ignition but if it looks to connect directly to a HT lead then it is magneto ignition. In the case of coil ignition, the coil and rectifier would have been mounted under the seat. I would have to do some research but would expect it would be similar to my D14 with the coil bolted to the rear mudguard via a bracket and the rectifier mounted on a bracket connected to the other tinware.
To see the difference between coil and magneto models, the drawing below is for the magneto equipped D1-D3 models.
Hi AWJDThumper
after having another look your 2'nd picture is correct the HT lead is detached and I am hoping to be able to solder it back.
Thank you for you help.
Kelvim
At least that solves the problem of working out where to put the coil!
I find early Bantams a little complicated to follow in terms of electrics because, at various times, they used both Wipac or Lucas electrics which were not the same. They also used direct lighting (no lead acid battery) or alternator powered lighting, with the former not needing a rectifier and the latter using a very large selenium rectifier.
If your Bantam has a conventional battery then it would have had a large rectifier mounted under the seat. On the D14, there is a cross bracket bracing the back of the air filter box (RHS) and the toolbox (LHS) which also supports the back of the rear mudguard. This cross bracket has a small tab on it on to which the rectifier is bolted to sit above and behind the battery.
Trying to work out where the horn should go is a challenge. On the D14, there is no vertical panel in front of the battery and therefore the horn is mounted in front of and to one side of the battery. On the D3, it is possible that the horn was mounted behind one of the side panels which sounds daft but was the sort of thing BSA did. I haven't seen a single picture of a D3 in which you can see the horn which therefore appears to be hidden away.