During 1940 the UK "MotorCycling" magazine did a series on servicing English motorcycles and some accessories...The US company Clymer reprinted them as a book....lets look at some of the items starting with Lucas,BTH and Miller...

Floyd Clymer, was a reasonably prolific publisher in the USA from WW2 up into the 1970's....

I've a booklet he published in 1944 which puts together a series from the UK "MotorCycling" motorcycle magazine done during 1940...
It includes service articles for many of the popular British makes in WD form as well as service items for Lucas, BTH and Miller in their WD format...
Lets have a look at the electrical items for this post....