JL,
If the coil was originally from a positive ground car, CB would be +.
The CB (contact breaker) is the points making a connection to ground
which is positive. The SW (ignition switch) lead would be -. If the coil
was originally from a negative ground car, reverse the description. All
Healeys were originally positive ground. A "modern" coil would usually
imply negative ground, but not for certain. It doesn't really matter
much which way the coil is connected. The "wrong" way will result in a
little less spark efficiency, but no disaster. If it is important, a
modern scope engine analyzer as used by most shops can quickly determine
if the coil is connected correctly. I never had much luck with the old
"pencil" test.
Dave Russell
BN2
James Lea wrote:
> At one time I knew the answer to this question but my brain seems to be
> forgetting more and more lately so here is an easy one. A stock coil says CB
> (contact breaker) on one side and SW (switch ) on the other. How does that
> relate to the + and - on a modern coil? Having a senior moment, JL
>
> James Lea
> Rockport Maine
> 1962 BT7 II
|