I'm wondering whether you mean the ignition relay doesn't click when you
turn on the ignition. The starter relay doesn't click until you turn the
key to crank, and is drowned out by the solenoid clicking if not the engine
cranking. I presume the engine is cranking? Originally the coil was
powered from the ignition relay, and if that isn't operating then you would
have no spark, but you would have no power on the second fuse up neither
would you have battery voltage on the coil +ve.
You say your car has a dizzie, but they all do. I'm assuming you mean it
has a replacement points dizzie of some type. If so, then it all depends on
whether the coil and coil wiring was changed when that was fitted.
Originally your car would have had a length of resistance wire (the ballast
resistance) in the harness in series with the coil. With the points closed,
and ignition on, if that circuit is good you should have 6v or less at the
coil +ve, not battery voltage. Battery voltage there implies there is no
continuity through the coil, the points, and the distributor earth wire, or
maybe no ballast resistance.
Late MGBs with the 45DM4 distributor may well have had a 32C5 coil, which
may have measured as low as 0.8 ohms on the primary. Using one of these
with points ignition, or some other non-standard ignition system, could well
result in significant overheating and damage to the coil. A 0.1 ohm coil,
if that is what you are saying you have, has either gone short-circuit or is
completely the wrong coil and is one intended for modern electronic systems
that use a very short pulse of high voltage. However you need to remove the
wiring from the coil before you can measure its primary resistance as there
are other components on the wiring that goes to it that will affect the
reading.
You are going to have to go back to first principles and determine whether
you have the ballast resistance in circuit or not, which will determine
which type of coil you should have. If your coil doesn't measure up to that
it has probably failed and will need replacing with the correct one. Then
you will need to check the circuit through the points and the distributor
earth wire, as excessive current that is enough to damage the coil will
likely damage these as well.
PaulH.
----- Original Message -----
> Any suggestions of observations from the above?
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